氯离子环境下机械部件涂层Cr/CrN杂化层的摩擦腐蚀性能

M. Kowalski, A. Stachowiak
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引用次数: 9

摘要

本文的目的是通过比较两种材料溶液来确定材料硬度对摩擦腐蚀过程的影响。分析涉及对过程强度的评估和确定造成材料损失的机制。确定了高硬度材料摩擦腐蚀的可能机理。测试了两种经典的材料解决方案(基于AISI 1045钢),以确保亚表层的高硬度:通过额外的氧化和浸渍过程进行氮化,以及物理气相沉积(PVD)涂层。为了在每个单独的测试中更好地识别硬度对摩擦腐蚀过程的影响,增加了接触区的压力。在3.5% NaCl溶液中进行了摩擦腐蚀试验,试验条件为自由腐蚀电位(OCP)。文中提出的摩擦腐蚀试验结果表明,在两种材料溶液中,摩擦和腐蚀的协同效应可以通过相同的材料去除机制产生。这些机制的强度是由材料硬度决定的。协同效应产生的可能机制可能与沿摩擦路径局部凹坑的形成有关。由硬表面层开裂引起的腐蚀过程产生局部空洞,这很可能在连续的时间间隔内加剧摩擦磨损。空腔周围的区域有利于塑性变形,引发循环变形层的开裂和较大材料的撕裂(特别是在摩擦接触区较高的单位压力下)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tribocorrosion Performance of Cr/CrN Hybrid Layer as a Coating for Machine Components Used in a Chloride Ions Environment
The aim of the article was to identify the effect of material hardness on the tribocorrosion process by comparing two material solutions. The analysis concerned the assessment of the process intensity and the identification of the mechanisms responsible for material loss. Possible mechanisms of tribocorrosion common for materials of high hardness were determined. Two classic material solutions (based on AISI 1045 steel) ensuring high hardness of the subsurface layers were tested: nitriding with an additional oxidation and impregnation process, and Physical Vapour Deposition (PVD) coating. In order to better identify the impact of hardness on the tribocorrosion process in each individual test, the pressures in the contact zone were increased. The tribocorrosion tests were carried out in 3.5% NaCl with free corrosion potential (OCP) for the ball-on-plate system. The results of the tribocorrosion tests presented in the article indicate that the synergy effect of friction and corrosion can be generated by the same mechanisms of material removal in both the material solutions tested. The intensity of these mechanisms is determined by material hardness. The likely mechanism of generating the synergy effect may be related to the formation of local pits along the friction path. The corrosion processes that are initiated by the cracking of the hard surface layer create local cavities, which most probably intensify frictional wear in successive time intervals. The area around the cavities facilitates plastic deformation, the initiation of cracking of the cyclically deformed layer and the tearing of larger pieces of material (especially at higher unit pressures in the frictional contact zone).
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