Corrosion Susceptibilities of Magnesium Alloys AZ91, EZ33 and ZE41

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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.

Author(s):
Gallaccio, Anthony ; Ebihara, William T.
Author Organization(s):
ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ FIRE CONTROL AND SMALL CALIBER WEAPON SYSTEMS LAB
Descriptive Note:
Final rept.
Pagination:
0033

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARSCD-TR-83007
Monitor Series:
ARDC*
 Subject Terms
Joint Capability Areas:
JCA_8.1_Communicate; JCA_8_Building Partnerships; JCA_5_Command and Control; JCA_5.3_Planning; JCA_8.1.1_Inform Domestic and Foreign Audiences; JCA_8.1.3_Influence Adversary and Competitor Audiences; JCA_6_Net Centric; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_6.1.2_Wireless Transmission; JCA_6.4.1_Secure Information Exchange; JCA_3.2_Engagement; JCA_3_Force Application; JCA_6.1_Information Transport; JCA_1_Force Support; JCA_3.2.1_Kinetic Means; JCA_1.2.5_Lessons Learned; JCA_5.2_Understand; JCA_5.6.3_Assess Achievement of Objectives; JCA_5.6_Monitor
Modernization Areas:
Microelectronics
Communities of Interest:
Weapons Technologies
Descriptor(s):
*CORROSION, *TRANSMISSION GEARS, *MAGNESIUM ALLOYS, MICROSTRUCTURE, PANELS, POROSITY, HYDROGEN, HELICOPTERS, SODIUM CHLORIDE, HOUSINGS, HOMOGENEITY, CASTING ALLOYS, TRANSMISSIONS(MECHANICAL)
Field(s)/Group(s):
Helicopters, Properties of Metals and Alloys, Machinery and Tools
Keyword(s):
MAGNESIUM ALLOY AZ91, MAGNESIUM ALLOY EZ33, MAGNESIUM ALLOY ZE41, S L CHANGE 8420
Report Date:
1983 Jun 01