中文摘要：

既有水工钢闸门的主要防腐方法是在钢基体上热喷涂金属涂层，本试验针对Q 235裸钢、Z n －15％Al热喷涂涂层在3．5％ NaCl溶液中的腐蚀行为进行对比研究，并分析各自的腐蚀机理。结果表明：裸钢的腐蚀产物（FeOO H和Fe3 O4）随浸泡时间的增加而增厚；Zn－15％ Al涂层的腐蚀产物（锌和铝的氧化物及氢氧化物）具有自封闭性，保护基体，减缓腐蚀。裸钢与Zn－Al涂层在快速腐蚀试验中的腐蚀退化过程均呈非线性规律，与自然环境下钢闸门构件锈蚀退化过程相符。

英文摘要：

T he main anticorrosive method of existing on hydraulic steel gates is thermal spray metal coat‐ings .In this experiment ,the corrosion behaviors of the bare steel and the Zn‐15% Al thermal spray coating in 3 .5% NaCl solution are investigated ,each corrosion mechanism is analyzed .The results show that the corrosion products （FeOOH and Fe3 O4 ） of the bare steel increases with the increasing of the immersion time .The corrosion products （oxides and hydroxides of zinc and aluminum ） of the Zn‐15% Al coating has a self‐closing property to protect the substrate and reduce corrosion .The corrosion degradation processes of the bare steel and Zn‐Al coating in fast corrosion test show nonlinear law ,which matches with the corro‐sion degradation process of the steel gate components in the natural environment .