Present Status and Progress of Corrosion Protection for Microchannel Heat Exchangers of Al-alloy
Microchannel heat exchangers of Al-alloy are the important component for air conditioner,of which the primary material is 3003 Al-alloy.In practical applications,the Al-alloy is suffered from corro-sion and then results in the heat exchanger failure.This paper firstly introduces the corrosion problems existing in microchannel heat exchangers,then reviews the corrosion causes and influencing factors,such as coolants,micro-galvanic corrosion of the alloy and air pollutants etc.,and summarizes corrosion control methods such as inhibitors and surface treatments.Finally elaborates some surface treatment techniques developed for 3003 Al-alloy,including electroless plating,anodizing,chemical conversion,sol-gel treatment etc.,which probably provide references for the development and production of corrosion-re-sistant microchannel heat exchangers of 3003 Al-alloy.
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