热喷涂钢柱10年海水腐蚀行为

CORROSION PERFORMANCE OF THERMAL SPRAYED STEEL PIPES EXPOSED TO MARINE ENVIRONMENT FOR 10 YEARS

采用直流电弧喷涂和火焰喷涂技术 ,在碳钢管表面沉积了 1 2种类的Zn、A1和Zn 1 3A1涂层 .在日本的千仓海岸进行海水腐蚀实验 .结果表明 ,在 5年暴露期内 ,所有的涂层均没有发生明显的腐蚀 ;经 7年暴露后 ,未经封闭和经封闭处理的Zn涂层在浸泡区出现严重的锈蚀 .电弧喷涂并经封孔处理的A1涂层 ,火焰喷涂并经封孔处理的Zn A1涂层和火焰喷涂并经重涂装的Al涂层显示出优良的耐蚀性能 .相比之下 。

Thermal spray committee of Japan Association of Corrosion Control (JACC) has been conducting a corrosion test of thermal sprayed Zn,Al and Zn\|Al coatings in coastal area since 1985, this paper summarizes experimental data of 10 year exposure. 12 kinds of Zn,Al and Zn\|13Al coatings were deposited on steel pipes by DC arc\|spraying and flame\|spraying in varied thickness, and 7 kinds of them were subjected to various sealing and heavy painting post\|treatment. The corrosion performance of the coated steel pipes were inspected annually by recording the apperance and coating thickness in sea air, splash and tidal zones. For 5 year exposure, no significant changes were observed for all the coatings, but Zn coatings with or without sealing suffered rust corrosion in the tidal zone after 7 year exposure. Arc\|sprayed Al with sealing, flame sprayed Zn\|Al with sealing and flame sprayed Al with heavy painting showed excellent rust resistance while flame sprayed Zn or Al without sealing allowed the corrosion of steel pipes resulting in heavy rusting.