应用电化学极化技术、电化学阻抗谱、模拟浸泡实验,研究了X70钢在模拟潮湿存储环境中点蚀的发生机制及规律.结果表明,X70钢在模拟潮湿存储环境中可以发生点蚀,导致点蚀发生的腐蚀介质来自于层流冷却水中的腐蚀性物质,其中HCO-3和NO-3是致钝剂,而Cl-和SO42-可破坏钝化膜,促进点蚀发生.在0.5 mol/L的NaHCO3介质中当Cl-浓度达到0.02 mol/L时钝化膜即失去保护性.CI-浓度是影响点蚀的萌生和发展的关键因素,当其浓度较低时点蚀容易形核,但仅有少数能够长大；而当其浓度适中(约0.149 mol/L)时点蚀敏感性最高,点蚀容易长大；当其浓度过高时发生均匀腐蚀,点蚀难以长大.
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