← Glossary

Aluminum-Magnesium Stress Corrosion Cracking Susceptibility

Magnesium-rich aluminum alloys are prone to cracking under tensile stress and corrosion because they anodically separate in corrosive media.

Physical-Chemical Mechanism of Action

Aluminum-magnesium alloys separate at grain boundaries. Magnesium forms a weak layer on the surface that becomes anodically polarized under corrosive attack. This leads to stress cracking.

Metallurgical Relevance & Welding Risks

This susceptibility can cause cracks and corrosion in the weld, especially under tensile stress. The tendency to separation increases the risk of hot cracking and porosity.

Workshop Practice & Handling Instructions

Use corrosion-resistant protective agents for magnesium-rich alloys and ensure careful cleaning. Keep cooling controlled and avoid rapid cooling phases to minimize cracks.

MetallurgieSchweißtechnik

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