海洋环境下热喷涂锌、铝及其合金涂层防腐蚀机理研究概况

Anticorrosion Mechanism of Thermal Spraying Coatings of Zinc and Aluminum and of Alloys Made of the Same in Marine Environment: A Review

综述了国内外几十年来在不同海水环境中对热喷涂锌铝及其合金涂层防护性能和机理研究的成果。热喷涂锌铝及其合金涂层在海洋环境中具有优良的长效防护性能,锌具有优良的电化学保护性,铝具有比锌更好的化学稳定性,锌铝合金既保留了锌的电化学特点,又具有铝的化学稳定性能。指出了今后的研究重点应该是金属与有机复合层在浪花飞溅区苛刻腐蚀环境下界面的腐蚀规律和腐蚀机理的探讨,对金属与有机复合层界面的腐蚀原因在理论上做出了本质的解释,并能预测涂层体系的防腐蚀寿命。

With the development of marine exploitation and utilization, it is essential to investigate the long-term corrosion resistance of thermal spraying zinc, aluminum and zinc-aluminum alloy coatings for steel structure in marine environment, which is critical to ensuring the safety of the structures and effectively prolonging their service life. Thus a review was given on the study and progress of the corrosion resistance and anticorrosion mechanism of the thermal spraying coatings in various marine environments within the past several decades. It was pointed out that the thermal spraying aluminum, zinc and aluminum-zinc alloy coatings have excellent long-term corrosion protection for marine steel structures. The zinc coating has high electrochemical sacrificial protection ability, the aluminum coating has excellent electrochemical stability, and the zinc-aluminum alloy coating has the combined characteristics of both the zinc and aluminum coatings. It was suggested to focus on the corrosion process and mechanism of the thermal spraying alloy coatings for steel structures in the splash zone and on the corrosion-induced interfacial failure of the composite coating on metal substrate. This would be beneficial to establishing the theoretical basis for the development of novel anticorrosion technologies and lifetime prediction technologies.