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PRODUCT DATA of AZ31B
MaterialAZ31B
General InformationMagnesium-Aluminium-Zinc-Manganese Alloy
Chemical Composition3% Al, 1% Zn, 0.2%Mn, Rem. Mg
Name of ManufacturerMagnesium Elektron
PO Box 23, Swinton, Manchester M27 8DD, UK
+ 44 (0)161 911 1000
+ 44 (0)161 911 1010
www.magnesium-elektron.com
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeLow
Equivalent DesignationsASTM AZ31B, BS 111, DIN 1729, MgAl3Zn
Space ExperienceGood
PHYSICAL PROPERTIES
Specific Gravity1.78
ELECTRICAL PROPERTIES
Electrical Volume Resistivity9.2e-7 ohm.m @RT
THERMAL PROPERTIES
Temperature Range150 °C(maximum)
Thermal Conductivity84 W/m.K @RT
Thermal Expansion Coefficient26 to 27 μstrain/°C @RT
Melting Range605 to 630 °C
Specific Heat1 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusRequires specific corrosion protection
Atmospheric CorrosionHas poor resistance to atmospheric corrosion and should always be protected. Protective treatment can be either anodising or chromating and painting
Stress Corrosion StatusLow Resistance to SCC: Table 3
Remark: Not for primary structural items
Is prone to stress corrosion cracking in air, fresh water, sea water and salt solutions. Not suitable for structural applications. For high stress applications, see ECSS-Q-ST -70-36C
Remark: Requires Stress corrosion evaluation form
Remark: acc. to ECSS-Q-ST-70-36C
Data Quality: Design Data
EMF vs SCE-1.6 V
Remark:measured in 3.5% NaCl
Bimetallic CorrosionCan be connected in a clean room environment to: Sn-Pb alloys, Sn, Pb Needs specific measures: All others
Temperature Range(space)Maximum application temperature is 150°C.
SPECIAL RECOMMENDATIONS
Special RecommendationsThe part should be Lanolin covered or oiled at all times during machining and prior to protective treatments so as to avoid corrosion. · Protective treatments can be either: 1. Anodising and painting, 2. Chromating and painting. · The part should never make direct contact with other metals. Magnesium is more electrochemically negative than all other commonly used metals and will therefore be sacrificially corroded in any electrochemical cell that is created.