目的 探究高速电弧喷涂铝涂层在深水压力环境下的腐蚀行为。方法 利用电化学阻抗谱、扫描电镜微观形貌观察、物相衍射和红外光谱等锈层分析手段，分析高速电弧喷涂铝涂层在不同实验条件下的腐蚀行为，并对实验结果进行了对比研究。结果 3 MPa高压浸泡72 h的铝涂层表面腐蚀产物呈现疏松粉状，并出现了腐蚀坑洞，铝涂层快速失效。常压浸泡72 h后的铝涂层表面腐蚀较轻，常压浸泡720 h后的铝涂层表面则已被腐蚀产物完全覆盖。经XRD分析，三种条件下的铝涂层腐蚀产物基本一致。进一步利用傅里叶变换红外光谱（FTIR）分析可知，3 MPa高压条件下，压力加速了碱式氯化铝水合物Al9Cl6(OH)21?18H2O、Al5Cl3(OH)12?4H2O等腐蚀产物的形成。这些腐蚀产物在高压下不能有效结合，且易于流失，致使涂层耐蚀性能快速下降。结论 铝涂层在高压条件下形成的腐蚀产物不能有效覆盖在涂层表面阻止腐蚀介质侵入，导致铝涂层的耐蚀性能下降。

The work aims to study corrosion behavior of high velocity arc sprayed (HVAS) Al coatings. Corrosion behavior of HVAS Al coatings in different experimental conditions was analyzed in rust layer analysis methods including electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) microstructure observation, X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The experimental results were studied comparatively. After 72 h immersion at 3 MPa, corrosion products on the Al coatings became loose powder-like, corrosion pits appeared and the Al coatings failed quickly. After 72 h immersion at atmosphere, the Al coatings were slightly corroded; after 720 h immersion at atmosphere, the Al coatings were completely covered by corrosion products. XRD analysis showed that corrosion products of the Al coatings were similar. FTIR analysis showed that pressure accelerated generation of corrosion products including basic aluminium chloride hydrate Al9Cl6(OH)21?18H2O and Al5Cl3(OH)12?4H2O at 3 MPa. The corrosion products could not adhere to each other and would easily run off at high pressure, hence corrosion resistance of the coatings degraded quickly. Corrosion products of Al coatings at high pressure can not effectively block corrosive medium invading, hence corrosion resistance of Al coatings degraded.