Abstract
Aluminum alloys are widely used in engineering structures and components where corrosion resistance is required because it has protective layers of aluminum oxide. However, galvanic corrosion can occur when aluminum alloy is placed in electrical contact with other metals that have more positive corrosion potentials than aluminum. Furthermore, corrosion rate can be accelerated in crevice. In this study, crevice and galvanic corrosion characteristics of anodized aluminum in a NaCl solution at 25 0 were studied as thickness of aluminum oxide layer. Electrochemical test results indicate beneficial effect of oxide layer for corrosion resistance. As thickness of oxide layer increase, open-circuit potential and pitting corrosion resistance increase. The galvanic current decreases with increasing thickness of aluminum oxide layer. Crevice corrosion test results confirm the electrochemical test results and reveal the dependence of galvanic current on crevice corrosion behavior.
