Pit growth studies in stainless steel foils. II. Effect of temperature, chloride concentration and sulphate addition
Pit growth studies in stainless steel foils. II. Effect of temperature, chloride concentration and sulphate addition
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DOI：
10.1016/s0010-938x(01)00134-2
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发表时间：
2002-05
影响因子：
8.3
通讯作者：
P. Ernst;R. Newman
中科院分区：
文献类型：
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作者：
P. Ernst;R. Newman
采用箔技术观察 304 SS 在不同温度和氯化物浓度下或在抑制剂（硫酸盐）存在下二维凹坑的发展情况。将温度降低至 10°C 会导致凹坑形态发生巨大变化，由于凹坑环境中钝化的开始，导致孔隙度的发展和凹坑生长的振荡。将氯化物浓度从 1 降低至 0.001 M 的效果是促进凹坑深度而非宽度的生长。对凹坑扩大的抑制似乎是一种红外效应，作用于在更浓缩的溶液中发生底切以形成花边凹坑覆盖的点。尽管点蚀潜力有所增加，但在氯化钠溶液中添加硫酸盐可能会稳定点蚀的生长。所有结果均与使用一维铅笔电极获得的结果进行比较，提供有关坑盖几何效应的信息。
A foil technique was employed to view the development of two-dimensional pits in 304 SS at different temperatures and chloride concentrations, or in the presence of an inhibitor (sulphate). Decreasing the temperature to 10 ° C resulted in a dramatic change in pit morphology, with the development of porosity and oscillations in pit growth due to the onset of passivation in the pit environment. The effect of lowering the chloride concentration from 1 to 0.001 M was to promote pit growth in depth rather than width. The suppression of pit broadening appears to be an IR effect acting at the point where undercutting would occur to create the lacy pit cover in more concentrated solutions. The addition of sulphate to NaCl solution was shown potentially to stabilise pit growth despite the increase in pitting potential. All the results were compared with those obtained using one-dimensional pencil electrodes giving information on the geometrical effect of the pit cover.