The normal temperature corrosion of VC coating on the substrate of Cr12MoV prepared by TD process was tested in 5％ NaCl aqueous solution,its surface morphologies and corrosion components after salt spray were observed with SEM and EDS,respectively,and the effects of salt spray on micro-structures of VC coating were analyzed.Moreover,the invalidation mechanism of VC coating after salt spray and its effect on substrate material were discussed.The experimental results shown that the uniformity and integrity of VC coating surface are destroyed by salt spray for 120 h,a large number of the pits are produced on the coating surface,and the coating falls off,which speeds corrosion breakage of its substrate; the oxidated film on its surface becomes rougher,broken and discontinuous,and falls off easily,which reduce the ability of resistance salt spray; the failure modes of VC coating after salt spray are expressed with falling off of oxidated film,stress concentration and pore effect and so on,the corrosion breakage of oxidated film is the corrosion result of deoxidization corrosion from oxygen and HCl produced by NaCl and vapor.
参考文献
| [1] | 李广泽,乌晓燕,陈扬辉,李戈扬.反应磁控溅射碳化钒薄膜的微结构与力学性能[J].真空科学与技术学报,2009(02):168-172. |
| [2] | 龙霓东,朱金华.FeMnSiCrNi形状记忆合金在蒸馏水和3.5%NaCl溶液中的空蚀[J].热加工工艺,2009(16):45-47. |
| [3] | 储双杰.涂层碳纤维的抗拉强度与断裂特性[J].应用科学学报,1995(01):74-80. |
| [4] | 胡吉明,张鉴清,张金涛,曹楚南.LY12铝合金环氧涂层在NaCl溶液中的吸水与失效[J].金属学报,2003(09):955-961. |
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