16Mn 钢在海水中腐蚀疲劳断口形貌分析

Corrosion fatigue fractography of 16Mn steel in seawater

通过对环氧沥青基有机涂层保护下和无涂层１６Ｍｎ钢在空气、自然海水以及阴极保护条件下腐蚀疲劳断裂微观形貌的观察分析与比较，探讨了有机涂层保护下１６Ｍｎ钢的腐蚀疲劳（ＣＦ）机理．结果表明，有机涂层能有效地抑制金属阳极溶解，在阴极极化下，有机涂层不能完全阻止阴极反应产生的氢扩散到金属基体内部，涂层试样的断口呈现氢脆特征．

To observe the mechanism for corrosion fatigue(CF) of 16Mn steel with organic coating, a study and direct comparison was made of the morphology of fracture surface that had been produced by fatigue in air and in seawater at free corrosion and cathodic potential of 16Mn steel with and without a tar epoxy coating. The results show that, the organic coating effectively mitigate anodic dissolution, but does completely resist the diffusion of hydrogen into metal substrate. Under cathodic protection condition, the main fracture morphology with hydrogen embrittle characteristics was found.