研究了316L不锈钢在85℃含0.2%KCl，浓度为60%的醋酸水溶液中的腐蚀电化学行为，特别是研究了自腐蚀电位初期变化趋势。测试了空气中钝化24小时后、阴极极化后和阳极极化后，试样在醋酸溶液中自腐蚀电位随时间变化的曲线，结合阴极极化曲线、阳极极化曲线、试样的SEM微观观察和EDS成分分析，初步探讨了316L不锈钢在含Cl-醋酸溶液中的腐蚀电化学行为和点腐蚀发生的机理。研究还发现：在空气中放置24小时后的试样在Cl-醋酸溶液中能自钝化，自腐蚀电位为100mv；经阴极极化后的试样在Cl-醋酸溶液中不能自钝化，其自腐蚀电位为-242±3mv；经阳极极化形成的钝化膜比在空气中自然形成的钝化膜更致密。
The corrosion and electrochemical behavior of 316L stainless steel in acetic acid solutions at 85℃ has been investigated. Acetic acid concentration tested was 60% and included addition of 0.2% KCl. Of key interest was the trends of corrosion potential on initial period. Corrosion potential–time measurements were undertaken after the samples exposed to the air for 24 h were polarized anodically and cathodically in acetic acid solution. With analyzing of the curves of electrochemical polarization and SEM and EDS data of the samples ,corrosion and electrochemical behavior and mechanism of localized corrosion of 316L stainless steel in acetic acid solution with Cl- were discussed. The results show that the samples exposed to the air previously for 24 h can be passivated automatically in acetic acid solution with Cl- with the corrosion potential remaining 100mV(SCE).No such phenomenon was observed for samples which were cathodically polarized with the corrosion potential stabilizing at a value of -242±3mv. The passive film formed by anodically polarizing is more proof than formed in the air.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] |
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