ADC12 Aluminum Alloy Surface Corrosion Analysis and Preventive Measures
The surface corrosion of ADC12 aluminum alloy produce white powder.Through a variety of large instruments to detect the composition of white powder,and analysis of the cause of corrosion,give the measures to prevent corrosion.The analysis shows that the white powder on the corrosion surface of ADC12 aluminum alloy is mainly aluminum hydroxide oxide(A1OOH).The main reason for producing white powder may be that the α(Al)phase and Al2Cu phase form microbatteries under the action of water electrolyte.Aluminum atoms lose electrons and become aluminum ions dissolved in water.Oxygen in the air gains electrons and reacts with water to form hydroxide ions.Under the promotion of chloride ions,the matrix aluminum as the anode is constantly corroded.The corrosion is avoided by optimizing the processing technology and passivating the aluminum alloy surface.
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