在海洋环境中，船用铝合金通常采用传统有机涂料进行腐蚀防护。然而，在维修过程中发现，这种防护手段对于涂层下铝合金点蚀的抑制十分有限。针对这种现状，开展了船用铝合金表面防腐蚀强化技术研究，通过在铝合金基体与原防护涂料配套体系之间，增加一层无铬化学转化膜，起到防腐蚀强化作用。扫描电镜和电化学测试结果表明，该层转化膜结构致密，防腐蚀性能好，能使船用铝合金在海洋环境中的耐腐蚀能力得到强化和提高。
In marine environments, traditional organic coatings are generally used in ships for corrosion protection of aluminum alloys. However, a problem was brought forward during ship maintaining period, i. e., the organic coatings were not enough to control aluminum pitting corrosion under coatings. An enhancement technique of corrosion protection for aluminum alloy was investigated by adding a layer of chromate-free conversion coating between aluminum alloy substrate and organic coatings. The SEM and EIS experimental results showed that the chemical conversion coating had compact structure and exhibited good corrosion protection performance, and thus enhanced the anti-corrosion capability of aluminum alloy used in ships.
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