Abstract
Inhibition action of seroquel on corrosion of zinc in 0.1 M HCl solution was investigated using weight loss, electrochemical potentiodynamic polarization and impedance spectroscopic techniques. Corrosion inhibition efficiency showed the positive effect with increase in concentration of inhibitor and with the increase in temperature. Results obtained from all the methods are in good agreement with each other. Inhibition effect of inhibitor is due to the adsorption of seroquel molecule on zinc surface from bulk of the solution and the process of adsorption follows Temkin’s adsorption isotherm. Potentiodynamic polarization studies revealed that seroquel acts as a mixed type of inhibitor. Corrosion inhibition mechanism is explained by activation and thermodynamic parameters. Surface morphology of the corroded metal was studied by scanning electron microscopic studies and FT-IR spectrum of the corrosion product further confirms the process of adsorption of seroquel on metal surface.
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Introduction
Corrosion is a spontaneous surface phenomenon results in deterioration of metal or alloys when it interacts with surrounding environment. Zinc is one of the most important non-ferrous metals with numerous industrial applications and is mainly used for the corrosion protection of steel [1]. The corrosion of zinc is affected by both alkaline and acid solution and it is more severe in solution having pH lower than 6.0 and higher than 12.5, while within this range the corrosion is very slow [2, 3]. Under destructive condition, Zn metal suffers from corrosion which gives the rust with white color [4]. Industrial processes such as scale removal and cleaning of zinc surfaces with acidic solutions expose zinc to corrosion. Due to this, zinc material becomes unsuitable for industrial applications [5,6,7,8]. It has been found that one of the best methods of protecting metals against corrosion involves the use of inhibitors [9, 10]. These are substances that reduce the corrosion of metallic materials by controlling the metal dissolution [11]. Efficiency of an inhibitor is mainly dependent on its ability to get adsorbed on the surface of metal which involves replacement of water molecule at a corroding interface [12].
Inhibitors are organic compounds containing heteroatoms like nitrogen, oxygen, phosphorus and sulfur in its structure [13,14,15,16,17,18,19,20,21,22]. Most of the commercial inhibitors are toxic in nature; therefore, replacement by environmentally benign inhibitors is necessary [11]. Presently, there is a trend to replace existing inhibitors such as chromates and cyanides because of their harmful effect to the nature [6].
The majority of the inhibitor used to control the corrosion of zinc was considered to be toxic, and solubility of inhibitor is a major problem in the corrosive medium. So the focus is to use non-toxic medicinal compound to inhibit the corrosion of zinc. Corrosion of Zinc was inhibited using several inhibitor-like guaifenesin [23], ketosulfone [24], floctafenine [25], atenolol [26], N-arylpyrroles [27], anisidines [28], erythromycin [29], and hexamine [2]. The use of pharmaceutical compounds offers interesting possibilities for corrosion inhibition due to the presence of heteroatoms like nitrogen, sulfur and oxygen in their structure and is of particular interest because of their safe use, high solubility in water and high molecular size [30].
Several researchers used medicinal compound having the properties like antimalarial, antibacterial, anti-cancer, etc., as corrosion inhibitors for both steel and zinc. Since only a few work was done on the use of antipsychotic drugs as corrosion inhibitor like ziprasidone [31, 32], clozapine [33], etc. Further, our previous report on corrosion inhibition of steel with seroquel has shown good inhibition to corrosion [34], which triggered us to use seroquel to control the corrosion of another industrially important metal like zinc. Further seroquel possess majority of the properties required to be used as corrosion inhibitor, like the presence of electron-rich heteroatoms, i.e., N, S, and O, electron-rich functional groups like –C=N–, –OH, –NH, π electron-rich aromatic ring and good planarity to wrap the surface of metal and easy solubility. So in the present paper, corrosion inhibition of zinc in 0.1 M HCl solution was investigated using seroquel as inhibitor.
Experimental
Material
Zinc metal strips of pure grade 99.6% (Cu 0.17%, Ti 0.075%, Al 0.05%, Pb–Cd 0.003%, Fe 0.002%, Sn 0.001% and Mg 0.0005%, and remainder being Zn) were used to measure the corrosion rate. The metal strips were abraded by silicon carbide emery papers from 220, 480, 800, 1500 and 2000 grade and washed thoroughly with distilled water, degreased with acetone and properly dried. Weight loss studies were carried out in 0.1 M HCl solution using zinc strips with dimensions of 4 × 2 × 0.1 cm3. Zinc strips with an area of exposure of 1 cm2 were used for electrochemical studies. The 0.1 M HCl solutions were prepared using AR-grade HCl and double distilled water.
Inhibitor
Seroquel is an antipsychotic drug, used to treat schizophrenia and other bipolar disorder and used as inhibitor for corrosion of zinc in the present study. The IUPAC name of this drug is (2-[2-(4-dibenzo[b,f][1,4]thiazepin-11-yl-1-piperazinyl) ethoxy]-ethanol. Corrosive solution was prepared in 0.1 M HCl, by adding different concentrations of seroquel i.e., from 200 to 1000 ppm. Molecular structure of Seroquel is shown in Fig. 1.
Weight loss measurements
Weight loss studies were performed by immersing cleaned zinc strips in 100 cm3 of 0.1 M HCl solution containing different concentration of inhibitor. The experiments were performed at 303–333 K. Experiments were conducted by immersing the metal strips for 6 h in the corrosive medium. The corroded metal strips were taken out, washed with distilled water, dried in acetone and weighed. Measurements were done in triplicate and average values were presented.
Electrochemical measurements
The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements were carried out using CHI 608D electrochemical analyzer (manufactured by CH Instruments, Austin, USA) at 303–333 K. A three-electrode system with a reference electrode (saturated calomel), working electrode (zinc strip with an area of exposure 1 cm2) and an auxiliary electrode (platinum) was used for measurements. Prior to each electrochemical measurement, the working electrode was immersed in the solution for 30 min for the open circuit potential to reach a steady state. Polarization curves were recorded at a scan rate of 0.01 V s−1 in the potential range of − 0.2 to + 0.2 V to the open circuit potential value (OCP). EIS measurements were performed using the AC signals with amplitude of 5 mV s−1 for the frequency spectrum from 10 kHz to 1 Hz. All impedance data were fit to appropriate equivalent circuits (ECs) using the ZSimp Win 3.21 software. The impedance parameters were obtained from Nyquist and Bode’s plot.
Scanning electron microscopic studies
Surface morphologies of the metal specimens were recorded using Scanning Electron Microscope (model: VEGA3 TESCAN). For the studies, Zinc specimens were immersed in 0.1 M HCl solution for 6 h in the presence and absence of the seroquel inhibitor. Metal specimens were taken out, washed with distilled water, dried and analyzed by SEM technique. The potential of the accelerating beam employed was 25 kV.
IR spectral studies
FT-IR spectrum of the pure compound and the corrosion product scrapped from the metal surface was carried out using Frontier Perkin Elmer spectrophotometer.
Result and discussions
Weight loss studies
Zinc strips are subjected to weight loss measurements in 0.1 M HCl in the absence and presence of different concentrations of seroquel. The inhibition efficiency (% IE) values and surface coverage (θ) were found to be dependent on the inhibitor concentration. Corrosion inhibition increases steadily with increase in concentrations of inhibitor up to 1000 ppm and were calculated using Eqs. (1) and (2) and tabulated in Table 1. Figure 2 shows the variation of percentage inhibition efficiency with concentration of inhibitor at different temperature:
where \(\Delta m\) is the weight loss difference in the absence and presence of inhibitor, S is the surface area and T is the time of exposure in hours.
The percentage inhibition efficiency is calculated by the following relation:
where v ocorr and vcorr are the corrosion rates of zinc in the absence and presence of seroquel, respectively. The results from above observation lead to the conclusion that the compound under investigation is retarding corrosion of zinc in 0.1 M HCl solution. Inhibition efficiency increased with increase in concentration up to 1000 ppm and thereafter the inhibition efficiency remained almost constant. So that the concentration of 1000 ppm is taken as optimum to get higher inhibition. The observed inhibition effects of the seroquel could be attributed to its adsorption on zinc surface. This results in isolation of metal surface from the corrosive medium which reduces the dissolution of the metal by blocking their active corrosion sites.
Polarization studies
Tafel polarization plots were recorded for Zn strips in the absence and presence of various concentration of seroquel molecule at a temperature range of 303–333 K and are shown in Fig. 3. The electrochemical parameters such as corrosion potential (Ecorr), corrosion current density (icorr), cathodic Tafel slope (βc), anodic Tafel slope (βa) and inhibition efficiency (ηp) are given in Table 2. The ηp was calculated from the following relation:
where i ocorr and icorr are the corrosion current densities in the absence and presence of inhibitor, respectively. From the data available from Table 2, it is clear that corrosion current (icorr) decreases as the inhibitor concentration increases. From Fig. 3, it can be seen that cathodic and anodic polarization curves shifted towards lower current densities in the presence of inhibitor, indicating effective corrosion mitigation in hydrochloric acid. This can be attributed to decrease in rate of corrosion reaction of the zinc after the addition of inhibitor molecules to the medium. From the data presented in Table 2, it can be seen that the corrosion rate of metal decreased with increase in the concentration of inhibitor molecule at all the studied temperature. This indicates the progressive adsorption of inhibitor on metal surface with increase in concentration. Inhibition efficiency (ηp%) of the inhibitor increased with increase in temperature; from this, we can conclude that the seroquel is a better corrosion inhibitor for Zn even at high temperature. After the addition of inhibitor, the calculated change in corrosion potential (Ecorr) is not as large as ± 85 mV. It can be interpreted as seroquel is inhibiting both oxidation reaction of zinc at anode and reduction reaction at cathode, i.e., it acts as a mixed type inhibitor [35]. Further, the values of both anodic and cathodic Tafel slopes (βa and βc) change by the addition of seroquel to the corrosive medium indicating the influence of inhibitor on both anodic and cathodic reactions, i.e., the added inhibitor adsorbs on the active sites of anode and cathode and controls the corrosion of zinc by controlling metal dissolution as well as hydrogen liberation. So seroquel can be considered to be a mixed type of inhibitor.
Electrochemical impedance spectroscopy (EIS) measurements
Kinetics of the electrode process and surface properties at the metal–solution interface can be quantitatively explained by Electrochemical Impedance Spectroscopy. EIS is an easy and time-conserving technique for monitoring corrosion process. The results obtained are reliable because the measurements are performed very near to the corrosion potential. EIS is also a non-destructive test because the magnitude of potential applied is small [36].
Nyquist and Bode’s plots were recorded for zinc metal in the absence and presence of different concentration of seroquel in 0.1 M HCl solution at 303–333 K and shown in Figs. 4 and 5, respectively. The measured impedance data were analyzed by fitting into equivalent electrochemical circuit as shown in Fig. 6. The goodness of the fits was in the order of 10−4 indicating good correlation with the equivalent circuit model used. The experimental curve was almost exactly fitted with the curve obtained by the electrical equivalent circuit as is shown in Fig. 7. The calculated corrosion parameters like polarization resistance (Rp), double layer capacitance (Cdl) and the observed inhibition efficiency (ηz%) and the surface coverage value are presented in Table 3.
Nyquist plots shown in Fig. 4 represent that the sizes of the diameters of semicircles are influenced by the presence of seroquel molecule with that of the uninhibited solution, which clearly says the role of seroquel on corrosion rate. The diameter of the semicircle increases as the concentration of seroquel increases up to 1000 ppm, but above that no appreciable change was observed. Further, the Nyquist plots produced imperfect single depressed semicircles, which are referred to as frequency dispersion. This is commonly seen in solid electrodes and it is attributed to the roughness and other inhomogeneities of the electrode surface [37, 38].
From the Bodes plot presented in Fig. 5, the depressed semicircle usually obtained for metal–solution interface due to the roughness of the metal surface [36,37,38]. Corrosion of zinc in acid media results in the increase in roughness of the metal surface, which causes decrease in the phase angle. It was seen from the Bode’s plot that phase angle increased with increase in both inhibitor concentration and temperature. The data further support the progressive adsorption of inhibitor on the metal surface, which blocks the active sites, thereby reducing the corrosion rate.
The values of electrochemical impedance parameters obtained from fitting the experimental data to the used equivalent model are presented in Table 3. The data indicate that, as the inhibitor concentration increases the Cdl values decreases, Rp and the inhibition efficiency values increase. Decrease in Cdl values with increasing concentration of seroquel is due to increased thickness of electrical double layer suggesting that Seroquel molecule acts by adsorption at the metal solution interface. Increase in Rp values with concentration of seroquel indicates increase in charge transfer resistance. This assumption is also supported by the increase in the diameter of the capacitive loops with increase in Seroquel concentration.
Impedance study was also carried out at higher temperature from 303 to 333 K and the values are shown in Table 3. It has been found that the value of Rp decreases as the temperature increases in the absence of the inhibitor, which indicates the increase of corrosion at high temperature. But, the value of Rp increased significantly by the addition of seroquel at high temperature which indicates that the increase of adsorption thereby decreases the corrosion rate.
Sum of charge transfer resistance (Rct) and adsorption resistance (Rad) are equivalent to polarization resistance (Rp) [38]. The percentage inhibition efficiency (ηz%) was calculated using the following equation:
where Rp and R op are polarization resistance values in the presence and absence of seroquel molecule.
Adsorption isotherm and thermodynamic considerations
It has been found that the organic molecules retard the corrosion of metal by adsorbing on the metal surface. Adsorption of an organic molecule may be referred to be either physical or chemical and it depends on the molecular structure of inhibitor, nature of metal, solution temperature, etc. Vanderwall’s force is responsible for physisorption and chemical bonding occur during chemisorption. The ability of seroquel to act as corrosion inhibitor over zinc surface can be interpreted by the use of adsorption isotherms. Langmuir, Frumkin, Temkin and Freundlich isotherms were the most considerably utilized isotherms to know the mode of adsorption and to get the information about the nature of interaction between the inhibitor molecules with the metal surface [39]. Surface coverage (θ) for the various concentrations of the tested inhibitor was utilized to elucidate the preferable adsorption isotherm to determine the adsorption process. The adsorption on the corroding surfaces never reaches the real equilibrium and tends to reach an adsorption steady state. When corrosion rate is sufficiently decreased in the presence of inhibitor, the adsorption steady state has a tendency to attain quasi-equilibrium state. Now, it is reasonable to consider quasi-equilibrium adsorption in thermodynamic way using the appropriate adsorption isotherm [38]. Efficiency of an inhibitor increases with increase in adsorbed inhibitor molecules covering the active metal surface. Therefore, surface coverage (θ) can be calculated using Eq. (5):
The stabilization of the adsorbed inhibitor molecules differs according to the type of adsorption that is chemical or physical or both. The surface coverage (θ) values for various concentrations of inhibitor were tested by fitting to various isotherms. The linear regression coefficient (R2) of Temkin adsorption isotherm in Fig. 8 was found to be closer to unity, hence indicating that the inhibitor under study obeys Temkin adsorption isotherm which may be formulated as:
where θ is the degree of surface coverage, C is the inhibitor concentration, Kads denotes the strength between adsorbate and adsorbent and f is the heterogeneous factor of the metal surface describing the molecular interactions in the adsorption layer. If f > 0, mutual repulsion of molecules occurs and if f < 0 attraction takes place [40].
The equilibrium constants Kads are related to the standard adsorption free energy (ΔGo) as shown in the following equation [41]:
where 55.5 (mol L−1) is the molar concentration of water in solution, T (K) is the absolute temperature and R (J mol−1 K−1) is the molar gas constant. The Kads and ΔG oads values are given in Table 4. The negative values of ΔG oads indicate that the adsorption of seroquel on zinc surface is spontaneous. In addition, the higher value of Kads shows that the adsorption of inhibitor is a spontaneous process [24]. Generally, values of ΔG oads up to − 20 kJ mol−1 are consistent with physisorption, while those around − 40 kJ mol−1 or higher are associated with chemisorption as a result of the sharing or transfer of electrons from organic molecules to the metal surface to form a coordinate bond [42]. The ΔG oads values between − 29.17 and − 31.25 may be indicative of the both physisorption and chemisorption. It is evident from Table 4 that the values of ΔG oads decreased with increase in the temperature, which indicates that the adsorption of seroquel is a spontaneous process [43].
A plot of ΔG oads /T versus 1000/T is linear (Fig. 9) with the slope equal to ΔH oads and intercept to − ΔS oads . The change in free energy (ΔG oads ) of the corrosion process can be calculated at each temperature by applying the equation:
The enthalpy of adsorption was deduced from the Gibbs–Helmholtz Eq (8):
This equation can be rearranged to give the following equation:
It is well known that an exothermic adsorption (ΔH oads < 0) may involve either physisorption or chemisorption or a mixture of both the processes. As the ΔH oads values obtained are negative, we can say that adsorption of inhibitor on the zinc surface is exothermic process [42]. In this work, ΔS oads value is found to be negative which indicates that disorder is decreasing with increasing adsorption of seroquel on Zn surface in 0.1 M HCl [44]. Reason for this decrease in entropy may be given as inhibitor molecules were freely moving in the bulk solution (inhibitor molecule were chaotic), but later were adsorbed in an orderly fashion onto the metal surface, resulting in a decrease in entropy. Moreover, from thermodynamic principles, since the adsorption was an exothermic process, it must be accompanied by a decrease in entropy [42, 45].
Activation parameters
The effect of increasing temperature on the corrosion inhibition efficiency of seroquel on zinc in 0.1 M HCl solution was studied at a temperature range (303–333 K) in the absence and presence of different concentrations of inhibitor molecule. This can be known using Arrhenius equation and transition state equation, which can be given as:
where vcorr is the corrosion rate, A is the frequency factor, h is the Planck’s constant, N is Avogadro’s number, R is the molar gas constant, T is the absolute temperature, Ea is the apparent activation energy, ΔH* is the enthalpy of activation and ΔS* is the entropy of activation.
Figure 10 represents Arrhenius plot which gives a relation between (ln vcorr) v/s 1000/T in the form of straight lines for the corrosion of zinc in 0.1 M HCl solution in the absence and presence of inhibitor molecules at different concentrations. From Fig. 10, we can get information about Arrhenius factor A and the apparent activation energy Ea. The apparent activation energy corresponding to different concentration was calculated using the formula Ea = (slope × R) and along with Arrhenius factor A and it is tabulated in Table 5. The increase in Ea values in the presence of inhibitor when compared to blank solution indicates the strong adsorption of inhibitor molecules on the zinc surface [46, 47]. This may be explained as with increased adsorption of inhibitor molecules on the zinc surface creates an energy barrier for the spontaneous corrosion reaction on the zinc surface.
Figure 11 represents Transition plot which gives a relation between ln (vcorr/T) v/s 1000/T in the form of straight lines for the corrosion of zinc in 0.1 M HCl solution in the absence and presence of inhibitor molecules at different concentrations. The enthalpy of activation and the entropy of activation were calculated by the formula ΔH* = − slope × R, ΔS* = intercept − ln(R/Nh), respectively. For different concentrations, both ΔH* and ΔS* are calculated and tabulated in Table 5. The increase in positive sign of ΔH* indicates that the endothermic nature of the process, suggesting that the dissolution of zinc is slow, may be due to the formation of an energy barrier [48]. The − ΔS* values were found to be increasing which can be interpreted, as the activated complex in the rate-determining step represents a dissociation rather than an association, meaning that a decrease in disordering takes place going from reactants to the activated complex [49,50,51]. This is may be due to the orderly adsorption of inhibitor molecules on the zinc surface.
From the above observation, we can conclude that at low temperature, physisorption favors, whereas with increase in temperature, it follows chemical adsorption resulting in the formation of chemical bonding, which makes the molecule form a strong barrier between the metal surface and corroding medium which results in increase in inhibition efficiency with increasing temperature.
Scanning electron microscopy (SEM)
The surface morphology of zinc surface in 0.1 M HCl was recorded using scanning electron microscope. The SEM can investigate the changes in the morphological characteristics of the metal surface in the absence and presence of inhibitor [52, 53]. SEM images for zinc immersed in 0.1 M HCl for 6 h duration in the absence and in the presence of optimized concentrations of seroquel are shown in Fig. 12a, b, respectively. A great degree of corrosion can be seen on the zinc surface which was exposed to corrodent (acid) but the zinc surface was remarkably protected by 1000 ppm of seroquel, when it is added to the corrodent. This indicates that seroquel may have formed a protective film around zinc surface resulting in decrease in rate of destruction of the metal surface by the corrosion reaction.
FT-IR spectral analysis
The structure of the seroquel drug was confirmed by FT-IR spectrum and is shown in Fig. 13a. The presence of broad band at 3312 cm−1 indicates the presence of hydroxyl group stretching vibration. The peak at 2876 cm−1 is attributed to the presence of carboxylic acid O–H stretching vibration. The peak at 1595 cm−1 shows the presence of aromatic C=C bending vibration. The narrow peak at 1381 cm−1 is due to C–H absorption. The presence of narrow band at 1140 cm−1 is due to the C–O group. The peak at 763 cm−1 shows the presence of aromatic C–H bending vibration.
FT-IR analysis was also carried out to understand the interaction between the zinc surface and the inhibitor molecules. Figure 13b shows the FT-IR spectrum of scratched compound from zinc surface after corrosion. The presence of broad absorption peak at 3439 cm−1 attributed to the presence of hydroxyl group stretching vibration. The small peak at 2430 cm−1 ascribed to O–H stretch from the strong hydrogen bond with –COOH. The peak at 1600 cm−1 shows the presence of alkene C=C bending vibration. The narrow peak at 1387 cm−1 is due to –CH3 bending mode. The presence of narrow band at 1115 cm−1 is due to the C–O group. The peak at 657 cm−1 shows the presence of alkyne C–H bending vibration. The slight shift in absorption frequency [54] confirms the interaction of seroquel with metal surface.
Mechanism of inhibition
The information obtained from the IR spectrum of pure seroquel molecule and the corrosion product scrapped from the metal surface clearly indicates the involvement of seroquel in the corrosion inhibition. Generally, corrosion inhibitors adsorb on the metal surface from aqueous solution, thereby blocking the active sites of metal which are susceptible to corrosion. Adsorption of organic molecule happens through the electroactive functional groups, by donor–acceptor interaction with the vacant orbital of metal through coordinate bond. Since seroquel contains more number of electron-rich functional groups, like N, S, O and π electron-rich aromatic ring, it coordinates with metal through these heteroatoms and functional groups and results in reduction in the corrosion rate. In Fig. 13b, appearance of peak at 3439 cm−1 compared to 3312 cm−1 of pure compound (Fig. 13a) indicates the coordination of seroquel through –OH group. The appearance of peak at 2430 cm−1 compared to 2876 cm−1 shows the coordination through –OH group of carboxylic acid functional group. Slight shift in the wave number of the absorption peaks and appearance of peak corresponding to the different functional group of seroquel molecule in the IR spectrum of scrapped compound confirm the interaction of the seroquel with zinc metal and result in corrosion inhibition.
Conclusions
The corrosion of zinc in 0.1 M HCl was effectively reduced by seroquel drug molecule. The efficiency of corrosion inhibitor increases with increase in concentration and with increase in temperature. The inhibition efficiency of seroquel on zinc surface from the weight loss method is 84.38% at 333 K, which is in good agreement with inhibition efficiency of Tafel polarization (82.30%) and EIS (86.12%) at 333 K. From polarization curves, we can say that inhibitor acts as a mixed type inhibitor, which means that it reduces both anodic and cathodic corrosion reaction on the zinc surface. Adsorption of seroquel on the zinc surface followed Temkin adsorption isotherm by considering the experimental data obtained for different concentrations of inhibitor at different temperature. The values of ΔG oads are found to be negative and less than 40 kJ mol−1. The values of Ea increased in the presence of inhibitor when compared to blank. By these results, we can say that adsorption process is spontaneous. The corrosion product of zinc metal in the presence of seroquel is IR active and not IR active in the absence of inhibitor. From this, we can say that the adsorption of seroquel drug on the zinc surface has decreased the rate of corrosion. Furthermore, this is confirmed by SEM analysis. After detailed analysis of all the aspects, it can be said that seroquel is an excellent environmentally benign corrosion inhibitor for zinc.
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Guruprasad, A.M., Sachin, H.P., Swetha, G.A. et al. Adsorption and inhibitive properties of seroquel drug for the corrosion of zinc in 0.1 M hydrochloric acid solution. Int J Ind Chem 10, 17–30 (2019). https://doi.org/10.1007/s40090-018-0168-x
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DOI: https://doi.org/10.1007/s40090-018-0168-x