建筑用16Mn钢超疏水膜层的制备及耐蚀性研究

为提高建筑用16Mn钢的耐蚀性,采用磷化处理、铈盐钝化再经过硬脂酸修饰在16Mn钢表面制备出超疏水膜层。表征了膜层微观形貌和成分,并测试了表面粗糙度、水滴接触角和耐蚀性。结果表明:铈盐钝化、硬脂酸修饰后磷化膜的微观形貌、成分和表面粗糙度存在差异,导致表面润湿性和耐蚀性不同。只是通过增加表面粗糙度的方式无法制备出超疏水膜层,膜层呈亲水性或超疏水性与其耐蚀性之间存在关联性。钝化-修饰磷化膜表面水滴接触角达到150.7°,表现出超疏水性还具有良好的耐蚀性,能有效抑制16Mn钢腐蚀从而提高其耐蚀性。原因是钝化-修饰磷化膜表面形成微纳米粗糙结构,有利于俘获空气形成气垫,对腐蚀介质具有较好的阻隔作用,有效抑制腐蚀并降低腐蚀程度。

Study on Preparation and Corrosion Resistance of Superhydrophobic Coating on 16Mn Steel for Construction

In order to improve the corrosion resistance of 16Mn steel for construction,superhydrophobic film was prepared on the surface of 16Mn steel by phosphating treatment,cerium salt passivation and stearic acid modification.The micro-morphology and components of the film were characterized,and the surface roughness,water drop contact angle and corrosion resistance were tested.The results showed that the micro-morphology,components and surface roughness of the phosphating films were different after cerium salt passivation and stearic acid modification,and the wettability and corrosion resistance were different.Superhydrophobic film can not be prepared only by increasing the surface roughness,and the hydrophilicity or superhydrophobicity of the film was related to the corrosion resistance.The water drop contact angle on the surface of passivation-modified phosphating film reached 150.7°,showing superhydrophobicity and good corrosion resistance,which can effectively inhibit the corrosion of 16Mn steel and improve its corrosion resistance.The reason was that the passivation-modified phosphating film has micro-nano rough structure,which was conducive to capturing air and forming air cushion,and has a good barrier effect on corrosive media,effectively inhibiting corrosion and reducing corrosion degree.