Improvement Of Corrosion Resistance Of High-strength Aluminum Alloy By Fine-particle Bombarding Treatment

Author:  T. Morita, A. Sakamoto, C. Kagaya, H. Nakaguchi
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008070
Year of Publication:  2008
Abstract:  
ABSTRACT This study was conducted to investigate the effect of fine-particle bombarding (FPB) treatment on corrosion resistance of high-strength aluminum alloy. When the FPB treatment was carried out with fine particles of titanium, zinc or tin, the elements composing those particles were diffused over the surface and residual stress was introduced. In corrosion test, FPBed bolt-type specimens were immersed into 3 % salt water maintained at 373 K. During this test, the specimens were fixed by special fixtures to apply high tensile stress. After immersing the specimens in the salt water until 345.6 ks (4 days), 604.8 ks (7 days) and 864 ks (10 days), their corrosion features were observed on the cross-section in detail. The results showed that the corrosion resistance of the aluminum alloy was greatly improved by the FPB treatment and there was almost no corrosion on each FPBed specimens until 345.6 ks. KEY WORDS Fine-Particle Bombarding, Aluminum Alloy, Corrosion Resistance, Salt Water, Residual Stress