Investigation on Electrochemical Cathodic Protection for Cavitation-Erosion Reduction of Anodized Al Alloy

Abstract

This study investigated the damage prevention potential range of anodized 5083-H321 aluminum alloy under a cavitation-erosion environment in seawater. Various applied potential conditions were determined through the cathodic polarization experiment. Then cavitation-erosion experiments were conducted with the applied potentials and the current density, weight loss, and surface damage depth were analyzed. The results presented excellent cavitation-erosion resistance in the concentration polarization section (−1.0~−0.8 V).

Slippery liquid infused porous surfaces with corrosion resistance potential on aluminum alloy

“…Therefore, the external chloride ions will continue to enter pitting to maintain charge balance. At the same time, the hydrolysis of Al 3+ ions in pitting increases the acidity of the local solution, resulting in a decrease in the pH value, as shown in formula (7). The hydrolysis of chloride caused by the large amount of chloride ions will further aggravate the acidication of corrosion solution, thus promoting the continuation of corrosion.…”

“…5,6 Therefore, it is of great signicance to improve the corrosion resistance and prolong the service life of aluminum alloy by surface treatment technology. Corrosion resistance technology mainly includes electrochemical protection, 7 surface nano crystallization protection 8 and preparation of a superhydrophobic surface. [9][10][11][12] Slippery liquid infused porous surfaces (SLIPS) use lubricating oil to replace the air in the microstructure gap on the surface of the substrate, with the help of capillary action to lock the lubricating oil in the microstructure and form an oil lm on the substrate.…”

A study on surface microgrooves in cavitation test of 6061 aluminum alloy

“…Examples include anodizing, micro-arc oxidation and magnetron sputtering, etc. Anodic oxidation 11 is easy to operate, and the anodized ceramic coating has the advantages of compactness, homogeneity, and low porosity. Unfortunately, it has poor hardness, and the waste electrolyte pollutes the environment significantly.…”