多弧离子镀沉积TiCrN薄膜在中性盐雾环境下的腐蚀行为

Corrosion Behavior of TiCrN Film Deposited by Multi-Arc Ion Plating in Neutral Salt Spray Environment

采用多弧离子镀技术,分别在15-5PH不锈钢和65Mn弹簧钢基体表面沉积制备TiCrN薄膜,通过物相组成分析、宏微观腐蚀形貌观察及腐蚀产物分析等方法研究了TiCrN薄膜在5 wt.%NaCl中性盐雾环境下的腐蚀行为。结果表明:TiCrN薄膜主要由TiN相、Cr_(2)N相、TiCrN相、Ti相4种物相组成。15-5PH不锈钢和65Mn弹簧钢试样经中性盐雾试验后,薄膜的腐蚀形式主要为点状腐蚀,基体的腐蚀形式主要为均匀腐蚀。相对于金属基体,TiCrN薄膜中Ti、Cr元素的添加能够抑制TiN柱状晶的长大,使膜层整体结构致密,表面缺陷数量减少,基体耐腐蚀性能得到大幅提升。

TiCrN film was deposited on 15-5PH stainless steel and 65Mn spring steel by multi-arc ion plating.The corrosion behavior of TiCrN film in 5 wt.%NaCl neutral salt spray environment was studied by means of analyses of phase composition,macro-and micro-corrosion morphology and corrosion product.The results show that the main components of TiCrN film are TiN,Cr_(2)N,TiCrN and Ti.After the neutral salt spray test of the 15-5PH sample and the 65Mn sample,the corrosion of the film is mainly pitted corrosion,and the corrosion of the substrate is mainly uniform corrosion.Compared with the metal substrate,the addition of Ti and Cr elements in the TiCrN film can suppress the growth of the TiN columnar crystals,make the overall structure of the film layer dense,reduce the number of surface defects,and greatly improve the corrosion resistance of the substrate.