Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Alkaline Solution: Effect of Tribo-Film

doi:10.1007/s40195-022-01374-x

Abstract

Abstract:

Tribocorrosion behavior and degradation mechanism of 316L stainless steel (SS) in alkaline solution were studied. The SS was worn in 0.1 mol/L NaOH solution with different potentials to investigate the synergism between wear and corrosion. The SS showed larger material loss at a cathodic potential of - 0.8 V and lower material loss at anodic potential when compared with that under pure wear condition. This was inverse when compared with that in other corrosive media, such as H₂SO₄ and NaCl solutions. The formation of tribo-films with different properties at different potentials played decisive role in the degradation process. Tribo-films were formed at cathodic potential (- 0.8 V) and anodic potentials (0 and 0.4 V). The tribo-film formed at - 0.8 V had the highest O content and was very brittle. It resulted in the easily peeling off of the film and then the acceleration of material degradation. By contrast, the tribo-films formed at anodic potentials were more complete and the O content was much lower. Such kind of ductile tribo-films could protect the SS from wear. The locally high concentration of OH^- produced in the reduction reaction of oxygen at - 0.8 V could react with the tribo-film which consist of nano-particles (NPs) with high chemical activity and finally led to deep oxidation and embrittlement of the film. The passivation of the NPs at the anodic potentials could inhibit the oxidation of tribo-film to maintain its ductility.

Key words: Tribocorrosion, 316L stainless steel, NaOH, Tribo-film, Nano-particles

Jingyi Zou, Zhongwei Wang, Yanlong Ma, Liwen Tan. Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Alkaline Solution: Effect of Tribo-Film[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(8): 1365-1375.

Figures/Tables 14

Table 1 Chemical composition of used 316L stainless steel (wt%)

Cr	Ni	Mo	Mn	Si	C	Fe
16.61	10.15	2.1	1.5	≤ 1	≤ 0.03	Bal.

Fig. 1 Schematic diagram of the tribocorrosion test set-up

Fig. 2 Polarization curves of the 316L SS in 0.1 mol/L NaOH solution without/with sliding and the corresponding COF

Fig. 3 Currents and COF of 316L SS during the tribocorrosion tests with different potentials

Fig. 4 a 3D surface profiles, b 2D surface profiles and c statistic lost volumes of 316L SS after the tribocorrosion tests with different potentials

Fig. 5 SEM micrographs of 316 SS after the tribocorrosion test with different potentials

Fig. 6 SEM micrographs of NPs formed in tribocorrosion tests with - 0.8 V

Fig. 7 XPS spectra of the 316L SS after worn at - 0.8 V and 0.4 V

Fig. 8 SEM images and element line scanning of the latitudinal cross section of the wear track formed at a - 1.2 V, b - 0.8 V, c 0 V, and d 0.4 V

Fig. 9 SEM micrographs of 316L SS after worn at - 0.8 V with different time: a 1 min, b 2 min, c 3 min, d 5 min, e 30 min, and f 60 min

Fig. 10 Oxygen content on the 316L SS surface after worn at - 0.8 V with different time

Fig. 11 Material lost components under different potentials

Fig. 12 Analysis of cathodic region of the polarization curve of 316L SS in 0.1 mol/L NaOH solution

Fig. 13 Schematic diagram of the evolution of tribo-film at - 0.8 V

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