Atmospheric Corrosion of 7B04 Aluminum Alloy in Marine Environments
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초록
Outdoor exposure tests using of 7B04 aluminium alloy samples including plate, tensile and various SCCsamples were carried out in Tuandao station, Shandong province (East of China) and Wanning station,Hainan province (South of China). Corrosion characteristics including weight loss, microstructure, tensilestrength and SCC susceptibility were investigated. The corrosion rates in Tuandao and Wanning showedhigh to low and the corrosion rates changed to the following equation of w=atb (b<1). The corrosion of7B04 aluminium alloy in Wanning was more serious than that in Tuandao. Pitting appeared at early stageof expose test, and it can be changed to general corrosion with test time extension. The 7B04 aluminiumalloy of which specimen shapes are forging and thick plate also showed SCC (Stress corrosion cracking)in the marine atmosphere. The higher SCC sensitivity was observed in Wanning station than in Tuandaostation. The 7B04 aluminium alloy with a high stress level was more sensitive to SCC. Intergranular andtransgranular or a mixed mode of cracking can be observed in different marine exposure.
Abstract
Outdoor exposure tests using of 7B04 aluminium alloy samples including plate, tensile and various SCCsamples were carried out in Tuandao station, Shandong province (East of China) and Wanning station,Hainan province (South of China). Corrosion characteristics including weight loss, microstructure, tensilestrength and SCC susceptibility were investigated. The corrosion rates in Tuandao and Wanning showedhigh to low and the corrosion rates changed to the following equation of w=atb (b<1). The corrosion of7B04 aluminium alloy in Wanning was more serious than that in Tuandao. Pitting appeared at early stageof expose test, and it can be changed to general corrosion with test time extension. The 7B04 aluminiumalloy of which specimen shapes are forging and thick plate also showed SCC (Stress corrosion cracking)in the marine atmosphere. The higher SCC sensitivity was observed in Wanning station than in Tuandaostation. The 7B04 aluminium alloy with a high stress level was more sensitive to SCC. Intergranular andtransgranular or a mixed mode of cracking can be observed in different marine exposure.
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