Abstract
In the present work, the corrosion behavior of ultra-high strength steel (UHSS)-high strength steel (HSS) welded joint is investigated. In situ scanning Kelvin probe (SKP) and scanning vibrating electrode technique (SVET) are used to study the galvanic corrosion of the dissimilar welded joint in natural seawater medium. The UHSS zone is revealed to be the most cathodic region. Meanwhile, the HSS has a high anodic activity. The corroded surface shows that the calcareous deposit is observed in UHSS zone, and the rust layer is formed in HSS and weld metal (WM) zones. When the corrosion product layer is removed, the UHSS zone is revealed to suffer from the pitting corrosion, and the HSS and WM zones exhibit the uniform corrosion.
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1 Introduction
High strength steel (HSS) materials have been widely used in the automotive, bridge, marine transportation and petrochemical industries due to their excellent mechanical properties (Ref 1, 2). To expand the application of HSS alloys and improve their design flexibility in the ocean engineering and shipbuilding industry, the welding among dissimilar steels is indispensable (Ref 3). In recent years, the excellent mechanical property of HSS welded joint has received extensive attention. However, rare research on its corrosion problems can be found, especially for the welding joint used in many industries such as oil and shipbuilding (Ref 4, 5).
The corrosion decreases the mechanical property of the welded joints, so that this problem has to be seriously considered for its application. Abioye et al. investigated the effect of welding speed on corrosion behavior of the dissimilar welded joint of stainless steel and low carbon steel, and the corrosion performance was found to improve as the welding speed decreased (Ref 6). Huang et al. studied the effect of heat input on corrosion behavior of dissimilar welded joint and recommended a higher heat input to improve its corrosion resistance (Ref 7). Due to the difference in chemical and metallurgical change in the welding process, the coupling of two different steels may also lead to increased susceptibility to localized galvanic corrosion (Ref 8). Wint et al. investigated the local corrosion behavior of the dissimilar joint in 0.017 M NaCl. The dissimilar joint exhibited the corrosion centered on the UHSS part (Ref 9). Huang et al. discovered that the difference in microstructure and chemical composition resulted in various galvanic effect of the HSS welded joint (Ref 10). Although several factors (e. g., heat input, welding speed and the chemical composition of the steel) have been studied to influence the corrosion of the dissimilar welded joint, there is still little research on the UHSS coupled to HSS.
The aim of the present work is to study the corrosion behavior of the UHSS- HSS welded joint in corrosive environment. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used as electrochemical tools to study the welded joint. A combination of the scanning vibrating electrode technique (SVET) and scanning Kelvin probe (SKP) were employed to investigate the galvanic effect between the UHSS and HSS from the localized perspective. The morphology and composition of the corrosion products formed on welded joint surface after immersion test were revealed by SEM coupled with energy-dispersive spectroscopy (EDS).
2 Experimental Procedures
2.1 Materials
In this study, the UHSS and HSS sheets were used as the base metals, which were supplied by ANGANG STEEL Co., Ltd. (China). The yield strength of UHSS and HSS were 1049 and 672 MPa, respectively. The chemical composition of both steels is given in Table 1.
The UHSS-HSS weld joints were produced by manual welding process. The main parameters of manual welding process were 170 A welding current, 30 V welding voltage and 16 kJ/cm heating input. The test samples were cut from the middle part of the welded joints with a dimension of 90 × 30 × 3 mm.
2.2 Characterization
In order to observe the microstructure of the welded joint, the samples were grounded with silicon carbide paper up to 2400 grit under wet condition. Then, they were roughly polished with 2.5 µm diamond paste. Finally, they were polished with 1 µm diamond paste. After that, the specimens were etched with 4% nital solution (4 mL nitric acid + 96 mL ethyl alcohol). The microstructures of different zones were characterized using Zeiss Axio Observer Z1m optical microscope. Scanning electron microscopy (SEM, ZEISS ULTRA 55) coupled with EDS was used to survey the microstructure and the rust film on different zone of welded joint. The rust layer was removed from the corroded zone and subjected to spectroscopic analysis (Raman). Raman test was carried out using a Horiba LabRAM HR Evolution instrument with wavelength of 532 nm. The scanning range was fixed as 100-1600 cm−1.
2.3 Conventional Electrochemical Corrosion Tests
The surface of welded joint was mechanically ground sequentially to 2000 grit with silicon carbide paper and then diamond paste. After the polishing, they were rinsed with deionized water and absolute ethyl alcohol. Then they were dried by cold air. Except an exposed surface of 1 cm2, the rest of the surface was sealed with organic silicone sealant. The test was conducted in natural seawater collected from Aoshan Bay, Qingdao, China. The electrochemical tests were carried out on a VMP3 BioLogic electrochemical workstation in a three-electrode configuration at room temperature. The sample acted as working electrode (WE). A saturated calomel electrode (SCE) was reference electrode (RE), and a platinum sheet was counter electrode (CE). Before the experiment, the specimen was exposure to seawater for 1 h to keep the surface stability. The potentiodynamic polarization tests were conducted from − 0.25 to 0.25 V (versus Ecorr, corrosion potential) at a rate of 0.167 mV/s. The EIS measurements were performed at open circuit potential (OCP) after 1 h OCP test for achieving a stable state, and the frequency range was set from 10 mHz to 100 kHz with a 10 mV sinusoidal amplitude. The EIS data were fitted by ZSimpWin software. For EIS and polarization measurements, three trials were carried out to ensure the repeatability.
2.4 SKP Measurements
SKP potential maps were obtained using a Princeton VersaSCAN scanning electrochemical workstation. The probe was set to vibrate perpendicularly to the specimen surface at a frequency of 80 Hz with an amplitude of 30 μm. The mean distance between the probe tip and the sample surface was controlled at 100 μm. The working model of SKP was a step scan, by which the Kelvin probe was stepped over a designated area of the welded joint. The probe for knowing the potential was a tungsten wire with diameter of 500 μm, and the scanning speed was set as 500 μm/s.
2.5 SVET Measurements
The SVET measurements were carried out on a Princeton VersaSCAN electrochemical workstation. A Pt-Ir electrode probe (d = 10 μm) was placed on the assigned surface at a distance of about 100 μm. The vibrating amplitude of the micro-electrode was 30 μm, and the vibrating frequency was 80 Hz. When the microelectrode was located at the vibrating peak and valley, the potential difference (ΔE) was measured. The potential was detected on an area of 40 × 4 mm with a scanning rate of 500 μm/s. The current density in solution can be calculated using the following equation (Ref 11):
where j is the current density (A m−2), σ is the conductivity of the seawater solution (5.6 S m−1), ΔE is the measured potential difference (V), and A is the vibration amplitude adopted in the experiment.
3 Results and Discussion
3.1 The Microstructure of UHSS-UHSS Welded Joint
The microstructures of UHSS and HSS are shown in Fig. 1. It is observed that the microstructure of UHSS and HSS is relatively uniform tempered sorbite, for which fine granular cementite evenly distributes in the equiaxed ferrite (Ref 12). In Fig. 2, the microstructure of the heat affected zone (HAZ) and weld metal is demonstrated. The WM mainly consists of granular bainite with a few acicular ferrites. The HAZ at UHSS side shows bainitic microstructure. For HAZ at HSS side, it displays a microstructure with granular bainite and troostite.
3.2 Electrochemical Measurements
Figure 3 shows the potentiodynamic polarization curves of the UHSS, WM and HSS zones of the welded joint in natural seawater solution. From the curves, all the test samples exhibit an active response, suggesting the poor protection behavior of oxide film against corrosion. The corrosion kinetic parameters including corrosion potential (Ecorr) and corrosion current density (Icorr) are evaluated by the Tafel linear extrapolation method (Ref 13), as shown in Table 2. The corrosion potential is found to have a small difference between UHSS and HSS, but the corrosion current density is respectively about the scale of 10− 6 and 10− 5 A /cm2 for the UHSS and HSS, which shows that the UHSS has better corrosion resistance. This may be due to the higher Ni content (9.4%) in the UHSS compared with the HSS (3.73%), which provides a possibility for improving the corrosion resistance (Ref 14). Test results show that in the welded joint, the UHSS is less susceptible to be corroded. Moreover, there is little difference between HSS and WM on the corrosion resistance.
EIS measurement is performed to further investigate the corrosion resistance of UHSS, WM and HSS. Figure 4 shows the Bode and Nyquist plots of UHSS, HSS and WM after exposure to natural seawater. The Z′ is the real part of the total complex impedance, the Z″ is the imaginary part of the total complex impedance, and the |Z| is the total complex impedance. Figure 4(a) shows that the Nyquist plots of UHSS and HSS are all flat capacitive arcs, the larger diameter of which implies the larger charge transfer resistance and the better corrosion resistance (Ref 7). For WM, the Nyquist impedance plot consists of a capacitive arc at high frequency and an inductive loop at low frequency. The capacitive arc is attributed to the charge‐transfer process, and the inductive loop is caused by the absorption/desorption of the intermediate species formed during the charge transfer process (Ref 6). From the Bode − |Z| results shown in Fig. 4(b), it can be observed that the |Z| value of HSS and WM is approximately similar, which is lower than that of the UHSS. Thus, the corrosion resistance of the UHSS is the best.
Suitable electrical equivalent circuits (EEC) shown in Fig. 5 are used to fit the EIS data. For the equivalent circuit, Rf and Cf are respectively associated with the resistance and capacitance of the oxide film (corrosion product layer); Rct and CPEdl are corresponding to the charge transfer resistance and the double layer capacitance (Ref 15). For WM, the inductive element is incorporated into the EEC (Fig. 5b), considering the inductive behavior observed at the low frequency. RL is the inductive resistance and L is the inductance (Ref 16). CPE is a constant phase element, which is employed to replace pure capacitance, since the phase angle is not equal to − 90° (Ref 17). The impedance of CPE is expressed as: ZCPE = (Y)−1(jω)−n, where Y is the admittance in S cm−2 s1−n, ω is the frequency in rad s–1; j2 = (− 1), and n is the CPE power (Ref 18). The EIS parameters based on the EEC are listed in Table 3 with χ2 value ranging from 2 × 10− 3 to 5 × 10− 3. In general, Rct reflects the kinetics of electrochemical reaction at metal/solution interface, and a high Rct value denotes a low corrosion rate (Ref 19). In Table 3, it can be found that the UHSS shows the highest Rct among the three zones, which is in accordance with the lower value of current density obtained from polarization curve results.
3.3 SKP Measurement
Compared with the traditional EIS technology, the SKP technology allows in situ measurement of Volta potential variation over the metal surface (Ref 20, 21). In principle, the Kelvin probe with a fine tip measures the work function of a sample using the vibrating method. The work function of the sample can be determined by measuring the Volta potential difference between the sample and the reference electrode. It has been proved that the measured Volta potential difference linearly changes with the corrosion potential by rigorous calibration routine (Ref 22). The decrease in the work function or Volta potential (energy) can be considered as an increasing tendency for electron transfer. Hence, an enhanced propensity is expected to undergo electrochemical reaction (Ref 23, 24). The Kelvin probe is stepped over a designated area (40 × 4 mm) of the welded joint to obtain the potential distribution (Fig. 6). It is noticed that the potential ranges from 0 to 320 mV with maximum ΔV of 320 mV before immersion, which is higher than the critical value (ΔV > 200 mV) for triggering the galvanic corrosion (Ref 25). The potential value increases in order of HSS < WM < UHSS. The UHSS having high potential acts as cathode, and HSS having low potentials acts as anode. Hence, galvanic couple is formed. The HSS zone with low potential has an increased ability to become activated state, when being exposed to the corrosive medium. After exposure to natural seawater for 72 h, the surface is mapped for the second time, and it exhibits potential value in the range of − 410 to 350 mV with maximum ΔV of 760 mV, indicating a large driving force for corrosion reaction (Ref 18). The uneven potential profile after immersion is probably due to the uneven oxide layer formed on different zones (Ref 26). This phenomenon may be attributed to the galvanic corrosion occurring on the welded joint exposure to the natural seawater.
3.4 SVET Measurement
SVET is capable of sensing anodic and cathodic processes in active sites on metal surface by using a vibrating microelectrode (Ref 27). Figure 7 shows the SVET maps of the UHSS-HSS welded joint after different immersion time in seawater. During the initial 15 min of immersion, the anodic feature is observed at HSS zone. Meanwhile, the UHSS zone showing the cathodic feature is relatively unaffected by corrosion. After 1 h of immersion, the region of anodic attack persists, and it has grown from HSS to WM. However, the UHSS and the HAZ close to UHSS side remain completely cathodic feature (Fig. 7b). Extending the immersion time, the anodic attack initiating on the HSS has spread onto the whole welded metal, whereas the UHSS maintains relatively cathodic state. The anodic current density value of the welded sample deceases with the extending immersion time, which is ascribed to the formation of corrosion products on its surface (Ref 28, 29). The SVET results confirm that a galvanic cell is formed between HSS and UHSS, and HSS is preferentially attacked as anode.
3.5 Corroded Surface Characterization
The microscopic morphology of the corrosion product on welded joint after 72 h exposure to seawater solution is shown in Fig. 8. It can be found that there is some difference in the appearance of different zone. From the SEM images, the bouquet-shaped deposits are sparsely distributing on the surface of UHSS and the HAZ near to UHSS part, whose morphology is in accordance with calcareous deposit (Ref 30). The rust layer formed on HSS, HAZ near to HSS part and WM zone exhibits two kinds of morphology, such as flaky structure and flocculent morphology. The EDS tests are conducted to analyze the composition of corrosion product formed on the welded joint after immersion. For UHSS and HAZ near to UHSS, the Ca element weight contents (14.82 and 12.47 wt.%) are much higher than those of other zones, indicating the calcareous deposit formation due to the cathodic reaction. For the zones from HSS to WM, the corrosion product is mainly composed of iron oxide due to the reaction between metal and oxygen. The results of surface characterization confirm that the galvanic corrosion occurs on the UHSS-HSS welded joint after immersion in seawater, which properly matches the SVET results. It is worth to note that the corrosion extension of various region on the welded joints is not only dependent on the galvanic effect but also on the Ni/Fe ratio in the corrosion product. Generally, enriching of Ni element in the corrosion layer can block the introduction of Cl− to give a better corrosion protection for the substrate (Ref 14, 31). From the EDS results, the high Ni/Fe ration (0.071) value is observed in the corrosion product film for the UHSS, and the low value is corresponding to the HSS (0.020). Therefore, the UHSS will be better protected after the formation of the corrosion product layer.
The phase composition of the rust generated on HSS, HAZ near HSS side and WM zones was analyzed by Raman spectra, as shown in Fig. 9. It is observed that the iron oxide formed on HSS and WM zones is mainly composed of goethite (α-FeOOH) and hematite (α-Fe2O3). The strong peaks at 390−1 and 660 cm−1 correspond to α-FeOOH (Ref 32). The characteristic peaks of α-Fe2O3 are associated with the bands at 221 cm–1 and 285 cm–1 (Ref 33). The rust of HAZ near to HSS part is composed of α-FeOOH, β-FeOOH and γ-FeOOH (Ref 32). The complex mixing of different FeOOH phase generated on HAZ zone may be associated with its dual-phase structure (Ref 34).
The corrosion product is assumed to form in seawater in accordance with following cathodic and anodic reactions. The main cathodic reaction is oxygen reduction as follows:
Carbonate ions are generated by the slow reaction between atmospheric carbon dioxide and water, which can be expressed as follows (Ref 35):
Subsequently, the formation of CaCO3 will occur at cathodic sites:
Iron and oxygen form a rust compound at anodic sites involving several steps (Ref 33):
Figure 10 shows the morphology of UHSS-HSS welded joint after removing the corrosion product film. The pitting corrosion is observed in the UHSS zone. The WM and HSS zones are found to dissolve in uniform corrosion. Although the UHSS has been protected by cathodic effect provided by HSS, the corrosion is found after 72 h immersion. This phenomenon illustrates that the cathodic protection against UHSS weakens with extending immersion time. This may be attributed to the formation of corrosion product on various zones, which affects the potential value of each region. And the cathodic and anodic feature on the welded joint may reverse after a long period immersion.
4 Conclusions
In this paper, the corrosion behavior of the UHSS-HSS welded joint is studied. The main findings are as follows:
-
(1)
The corrosion behavior of welded sample is studied by EIS and polarization curve techniques. The UHSS shows the best corrosion resistance among all zones of the welded joint.
-
(2)
SKP results indicate that the HSS zone with low potential has an increased tendency to become activated state when being exposed to the corrosive medium.
-
(3)
SVET maps show that the localized anodic activity preferentially initiates at the HSS zone. Meanwhile, the UHSS remains completely cathodic activity at the early immersion stage.
-
(4)
The results of surface characterization confirm that the galvanic corrosion occurs on the UHSS-HSS welded joint. The calcareous deposit is generated on UHSS zone, and the rust layer is mainly formed on HSS and WM zones. After the removal of the corrosion product, pitting corrosion is observed on UHSS surface. Meanwhile, WM and HSS are consumed in uniform corrosion.
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The authors are grateful to Luoyang Ship Material Research Institute for the financial support for this research work.
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Liu, X., Sui, Y., Zhang, H. et al. Corrosion Behavior of High Strength Steel Welded Joint in Seawater: A Combinatorial Study Based on General and Localized Electrochemical Methods. J. of Materi Eng and Perform 32, 8337–8345 (2023). https://doi.org/10.1007/s11665-022-07699-z
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DOI: https://doi.org/10.1007/s11665-022-07699-z