Abstract
The corrosion behaviors of arc spraying 5083Al and Zn15Al coatings in a simulated marine environment were comparatively analyzed. The 5083Al coating exhibited lower corrosion rates and higher polarization resistance than the Zn15Al coating. Due to the lower solubility and higher supersaturation of Al(OH)3, the corrosion products of 5083Al coating presents a faster deposition rate and causes a denser and blocky corrosion products layer, which inhibits the penetration of Cl−, thereby enhancing corrosion resistances. Furthermore, in the case of coating cracking, the 5083Al coating, with lower potentials than EH36 steel matrix and lower self-discharge rate than the Zn15Al coating, acting as the sacrificial anode, is more suitable to provide durable protection for steels in marine environments.
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