Gaofeng Han

Comparison of tribocorrosion behavior between 304 austenitic and 410 martensitic stainless steels in artificial seawater

In order to obtain a comprehensive understanding of the tribocorrosion performance of 304 austenitic and 410 martensitic stainless steels in artificial seawater, systematic tests were carried out in this work. The results from intermittent test revealed that load and sliding speed had great influence on the cathodic shift of OCP caused by sliding wear. Through potentiodynamic and potentiostatic polarization tests, which were performed under cathodic, OCP and anodic potentials, it was confirmed that synergistic effects existed between wear and corrosion and were linked with applied potential. In addition, it was found that tribocorrosion behavior of the two alloys was affected by microstructural characteristics and chemical composition, which were closely related to the mechanical properties and repassivation kinetics of passive film. Particularly, 304SS exhibited a better localized corrosion resistance compared with that of 410SS due to the higher content of chromium and nickel. For both materials, hardness inside the wear track was higher compared with the unworn surface due to a rubbing-induced hardening effect.

Combined Effect of Chemical Surface Treatment of Kevlar Fabric and PTFE Fillers on the Water-Involved Tribological Performance of Kevlar Fabric/Phenolic Laminate

ABSTRACT The combined effect of chemical surface treatment of Kevlar fabric and solid lubricant polytetrafluoroethylene (PTFE) fillers on the water-involved tribological performance of Kevlar fabric/phenolic resin laminate was investigated. Results showed that the interfacial adhesion between Kevlar fabric and resin was improved because of chemical surface treatment on the Kevlar fabric, leading to a decreased wear rate but an increased friction coefficient of the laminate. The addition of PTFE fillers not only enhanced the wear resistance of the laminate but reduced its friction coefficient. Furthermore, the combination of surface treatment on Kevlar fabric and the PTFE filling can improve the wear resistance and friction-reducing property of the laminate to the largest extent.

Effects of NaCl concentration on wear–corrosion behavior of SAF 2507 super duplex stainless steel

Wear–corrosion behavior of SAF 2507 super duplex stainless steel (SDSS) in different concentrations of NaCl (from 0.5% to 8%, w/v) was investigated using a pin-on-disk tester. Friction coefficient and mass loss rate were determined, and the synergistic effect of wear and corrosion was analyzed by tribocorrosion-related parameters. It was indicated that wear–corrosion regimes were significantly influenced by NaCl concentration and the related mechanism was attributed to the two different phases inside SAF 2507. Self-protection behavior between the two phases inside SAF 2507 led to a significantly different wear–corrosion mechanism, compared to that in the single-phase metal. To the best of our knowledge, this is the first study about wear–corrosion behavior of SAF 5207 within a solution with different corrosivity. This research provided a new insight for researchers to look into the tribocorrosion behavior of alloys with different phases, and helped us to better understand the principle that we should follow while developing alloys employed in a corrosive environment.

Corrosion-wear behavior of 316L stainless steel under different applied potentials

Purpose This report aims to study the influence of applied potentials on the corrosion-wear behavior of 316L stainless steel (SS) in artificial seawater. Design/methodology/approach In this study, wear-corrosion behavior of 316L SS had been studied under different applied potentials in artificial seawater by using a reformed pin-on-disc test rig. The applied potentials were selected ranging from –1.2 to 0.3 V (vs Ag/AgCl). The friction coefficient, mass loss rate and current density were determined. Findings It was indicated that mass loss was determined by the combined effect of mechanical wear and chemical corrosion. The wear-corrosion process was synergistic effects dominate while mechanical wear contributed the major material mass loss. Practical implications The results helped us to choose the appropriate metals for application under the specified environment. Originality/value The main originality of this research is to reveal the corrosion-wear behavior of 316L SS under different potentials, which would help us to understand different states of 316L SS under different corrosion environments.