Accession Number : ADB075280
Title : Corrosion Susceptibilities of Magnesium Alloys AZ91, EZ33 and ZE41
Descriptive Note : Final rept.
Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ FIRE CONTROL AND SMALL CALIBER WEAPON SYSTEMS LAB
Personal Author(s) : Gallaccio, Anthony ; Ebihara, William T
Report Date : Jun 1983
Pagination or Media Count : 33
Abstract : An assessment was made of the corrosion susceptibility of cast magnesium alloys AZ91C-T6, EZ33A-T5 and ZE41A-T5. Efforts were made to establish the influence of as-cast and machined surfaces on the corrosion behavior. Cast test panels of AZ91C-T6 alloy were compared with specimens obtained from an AZ91C-T6 helicopter transmission gear housing. The corrosion rates were derived by measuring the hydrogen gas evolved by specimens immersed in sodium chloride solution. The relative order of corrosion susceptibility for panel specimens was: AZ91C-T6 EZ33A-T5 ZE41A-T5. AZ91C-T6 gear housing specimens exhibited the lowest corrosion rates. The lower corrosion behavior of housing material was attributed to its relatively uniform microstructure, compositional homogeneity and low level of porosity. The effect of micropores on corrosion behavior was through to mask the influence attributed to surface condition for the test panels.
Descriptors : *CORROSION , *TRANSMISSION GEARS , *MAGNESIUM ALLOYS , MICROSTRUCTURE , PANELS , POROSITY , HYDROGEN , HELICOPTERS , SODIUM CHLORIDE , HOUSINGS , HOMOGENEITY , CASTING ALLOYS , TRANSMISSIONS(MECHANICAL)
Subject Categories : Helicopters
Properties of Metals and Alloys
Machinery and Tools
Distribution Statement : APPROVED FOR PUBLIC RELEASE