Effect of Corrosion Resistant Coatings on the Fatigue Strength of Cast Magnesium Alloys.

摘要

A study was made for the Army Aviation Materiel Readiness Command to evaluate the effects of various surface treatments and corrosion resistant coating systems on the fatigue properties of three send cast magnesium alloys (AZ91-T6, ZE41-T5,and EZ33-T5) of current or potential use in helicopter component housings. This was part of a larger program undertaken by the Frankford Arsenal to provide significant reduction of costs and downtime associated with the corrosion degradation of these housings. Coatings evaluated were DOW 1and DOW 7chromate conversion coatings and the HAE and DOW 17anodic coatings,both light and heavy applications. Pretreatments such as acid pickling,shot peening,and polystyrene impregnation were also evaluated as well as several different organic topcoats.