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Clarification of Dynamic Corrosion Behavior and Electrochemical Approach to Corrosive Wear Mechanism

动态腐蚀行为的澄清和腐蚀磨损机制的电化学方法

基本信息

批准号：
09450064
负责人：
IWABUCHI Akira
金额：
$ 6.91万
依托单位：
IWATE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450064/
关键词：
Tribology Corrosive wear Electrochemical Fresh surface Dynamic corrosion Potential pulse method ) NaィイD22ィエD2SOィイD24ィエD2 solution Passive filem 腐食摩耗電気化学的手法動的腐食現象

项目摘要

We have investigated the corrosion behavior under sliding condition. Such condition is referred as dynamic corrosion, because on the surface suffered sliding friction fresh surface is exposed continuously and the corrosion behavior is quite different from ordinal corrosion, I.e., static corrosion.The electrochemical approach is very effective to understand the corrosive or electrochemical factor contributing corrosive wear. However, corrosive factor is determined by the product of area of the fresh surface exposed and corrosion current density of the fresh surface. Unfortunately both parameters are unknown. We assumed that the corrosion current density was estimated from the current density obtained by potential pulse method (PP method) .Wear experiment was carried out in NaィイD22ィエD2SOィイD24ィエD2 solution for SUS304 stainless steel, pure iron, pure copper, 6-4 Brass, pure aluminum and zirconium alloy (zircaloy-4) under free potential and controlled potentials.This evaluation method was quite good for corrosive wear of SUS304 under reciprocating sliding, continuous sliding and scratch test. In this case the anodic area (fresh surface area) is equivalent to the wear scar area.Chemical factor is not severe for wear of pure aluminum and zircaloy-4., where the mechanical wear, obtained at cathodic potential in the polarization curve from PP method, governed the wear. However, the steep potential drop occurs with the start of sliding and saturated soon.In this research the anodic area was assumed as the projected wear scar area, the real wear scar area considered the surface roughness, Hertzian contact area. If corrosion current density at the fresh surface is obtained from the PP method, the contact area during sliding would be estimated. This has not been cleared yet.Qualitative property of dynamic corrosion, therefore, is cleared in this research, even though the quantitative property is not sufficient.

我们研究了滑动条件下的腐蚀行为。这种情况被称为动态腐蚀，因为在受到滑动摩擦的表面上，新鲜的表面不断地暴露出来，其腐蚀行为与顺序腐蚀即静态腐蚀有很大的不同。电化学方法对于了解造成腐蚀磨损的腐蚀或电化学因素是非常有效的。而腐蚀系数则由新表面暴露面积与新表面腐蚀电流密度的乘积决定。不幸的是这两个参数都是未知的。假设腐蚀电流密度由电位脉冲法（PP法）得到的电流密度估算。在自由电位和控制电位下，对SUS304不锈钢、纯铁、纯铜、6-4黄铜、纯铝和锆合金（zircaloy-4）进行了Na￣￣D22￣￣D2SO￣￣D24￣￣D2溶液的磨损试验。该评价方法对SUS304在往复滑动、连续滑动和划痕试验下的腐蚀磨损均有较好的评价效果。在这种情况下，阳极面积（新鲜表面积）相当于磨损疤痕面积。化学因素对纯铝和锆合金-4的磨损影响不大。，其中，PP法在极化曲线的阴极电位处得到的机械磨损控制磨损。然而，随着滑动的开始，电位急剧下降，并很快饱和。在本研究中，假设阳极面积为磨损疤痕的投影面积，实际磨损疤痕面积考虑表面粗糙度、赫兹接触面积。如果用PP法获得新鲜表面的腐蚀电流密度，则可以估计滑动过程中的接触面积。这还没有被清除。因此，本研究明确了动态腐蚀的定性性质，尽管定量性质还不充分。