AH32钢表面制备复合涂层的疏水性能及耐蚀性能

Study on hydrophobicity and corrosion resistance of composite surface coating of AH32 steel

采用等离子体增强化学气相沉积和等离子渗氮技术在AH32船板用钢表面制备渗氮、类金刚石及渗氮/类金刚石复合涂层。利用扫描电镜表征不同涂层微观组织形貌的差异;利用失重法探寻不同涂层在海水中的耐冲刷腐蚀能力;利用动态接触角测量仪测量不同涂层的疏水性能;利用电化学工作站测量不同工艺下制备涂层的耐蚀性能,并讨论相关的疏水及耐蚀机理。结果表明:3种涂层均明显改善了AH32钢的耐海水冲刷腐蚀能力。制备涂层后,AH32钢的腐蚀失重率从2000g/(m^2·a)下降至1250~1500g/(m^2·a)。AH32基体接触角为74.9°,疏水性能最差。渗氮处理表面的接触角可达112.4°,疏水性能最佳。3种涂层的耐蚀性能明显优于AH32钢基体。仅镀类金刚石涂层的耐蚀性能略优于仅镀渗氮涂层,渗氮之后镀类金刚石复合涂层的耐蚀性能最佳。

Nitriding coating,diamond-like carbon coating,and nitriding/diamond-like carbon composite coating were deposited on the surface of AH32 steel by plasma enhanced chemical vapor deposition and plasma enhanced nitriding.The microstructure,erosion corrosion,hydrophobicity,and corrosion resistance of different coatings were investigated by SEM,corrosion weight loss experiments,dynamic contact angle instrument,and electrochemical workstation,respectively.The mechanisms of hydrophobicity and corrosion resistance of the coatings were discussed.The results showed that the erosion-corrosion performances of the AH32 steel with the three coatings were all improved.The corrosion weight loss of the coated AH32 steel decreased from about 2 000 g/m^2·a to about 1 500 g/m^2·a^1 250 g/m^2·a.The hydropobicity of the AH32 steel matrix was the lowest with a contact angle of 74.9°.The hydropobicity of the nitriding coating was the highest with a contact angle of 112.4°.The corrosion resistances of the three coatings were evidently superior to the AH32 steel.The corrosion resistance of the diamond-like carbon coating was superior to the nitriding coating slightly.The composite coating of nitriding and diamond-like carbon showed the best corrosion resistance.