Aluminum-Magnesium Stress Corrosion Cracking
Aluminum-magnesium stress corrosion cracking is a form of corrosion in high-alloy AlMg materials with increased magnesium content, where continuous precipitates at grain boundaries cause cracks under tensile stress.
Physical-Chemical Mechanism of Action
In aluminum-magnesium alloys (AlMg) with increased magnesium content, continuous precipitation of magnesium can occur at grain boundaries. These precipitates lead to local stress concentrations that cause cracking under tensile stress.
Metallurgical Relevance & Welding Risks
This corrosion can cause cracks and distortion in the weld. The tendency to stress corrosion cracking is higher at elevated temperatures and in humid environments. This can lead to reduced service life and safety risks.
Workshop Practice & Handling Instructions
To prevent stress corrosion cracking, take the following measures when welding AlMg materials:
• Use a clean and dry welding environment.
• Keep the weld under minimal stress during cooling.
• Control the temperature and cooling time to minimize crack formation.