ABSTRACT

In this work, the corrosion behaviour of aluminium (Al) and zinc (Zn) sacrificial anodes under AC interference were studied in 3.5% NaCl solution by AC corrosion simulation experiments, weight loss tests and surface morphology analyses. It was found that AC accelerated the corrosion of Al and Zn, and their corrosion rates increased with the AC current density, besides the localised corrosion of Al was much more obvious than Zn. When the AC current density was 100 A m⁻², the uniform corrosion rates of Al and Zn increased to 14.6 and 0.46 mm/year, respectively, which were 34.8 and 1.48 times of the free-corrosion rates of them. Meanwhile, both the uniform and localised corrosion rates of Al increased much more significant than that of Zn under AC interference.

摘要

本工作通过交流腐蚀模拟实验、失重试验和表面形貌分析，研究了铝（Al）和锌（Zn）牺牲阳极在交流干扰下在 3.5% NaCl 溶液中的腐蚀行为。结果表明，AC加速了Al和Zn的腐蚀，并且它们的腐蚀速率随着交流电流密度的增加而增加，而且Al的局部腐蚀比Zn明显得多。当交流电流密度为100 A m ^-2时，Al和Zn的均匀腐蚀速率分别提高到14.6和0.46 mm/年，分别是它们自由腐蚀速率的34.8和1.48倍。同时，在交流干扰下，Al 的均匀腐蚀速率和局部腐蚀速率均比 Zn 显着增加。