通过研究18-8奥氏体不锈钢在模拟孔内溶液中的均匀腐蚀行为,定量研究了孔内溶液浓度和温度对孔蚀发展速率的影响。测定了试样在模拟孔内溶液中的极化曲线,并将极化曲线的塔菲尔区直线外推,得到理想极化曲线和自腐蚀电流密度,据此对测定实际孔蚀速率的间接方法作了初步探讨,并对孔蚀核再钝化的条件作了详细讨论。
The effect of the solution temperature and concentration within pits on pitting growth rate of 18-8 austenitic stainless steel has been studied quantitatively under uniform corrosion condition. The practical polarzation curves (PPC) of the sample was measured in the simulated solutions within the pits. The ideal polarization curves and corrosion current densities were obtained by extrapolating the Tafe's lines of the PPC to corrosion potentials. The requirements for repassivation of pitting nuclei were discussed in detail. According to the experimental results, the authors attempted an initial approach to a method for measuring the practical rate of pitting growth.
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