[china aluminum industry network] Metal material produces SCC to need to have three conditions: (1) material is sensitive to SCC; (2) serves in the special corrosive environment (for the aluminum alloy, in the brine medium or the corrosive atmosphere); (3) Tensile stress. The main factors influencing the stress corrosion of aluminum alloys are environmental factors, metallurgical factors and stress factors. The three are interconnected and influence each other.
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1. Environmental factors The environmental factors that affect aluminum alloy stress corrosion include ion species, ion concentration, solution pH, oxygen and other gases, corrosion inhibitors, ambient temperature, and environmental pressure.
The stress corrosion of 2A12 and 7A04 aluminum alloys in different atmospheric environments was studied. It was found that aluminum alloys have different stress corrosion sensitivities in different environments and are more sensitive in the marine environment. Marine environments contain large amounts of salt and Cl- The protective film passing through the surface of the aluminum alloy enters the interior and corrodes it.
Experiments show that when the mass concentration of HNO3 solution is between 20% and 40%, the corrosion of the aluminum alloy is intensified, and the corrosion rate of the aluminum alloy reaches a higher point when the concentration is about 35%. In the concentrated HNO3 solution, the aluminum alloy The stress corrosion is not obvious, the reason for this phenomenon is due to the formation of a dense oxide film on the surface of aluminum alloy, which prevents further corrosion of HNO3.
2. Metallurgical Factors Metallurgical factors mainly include the casting methods, processing methods and the effect of thermal stress corrosion on the hot metal. It is found that cathodic polarization increases the stress corrosion sensitivity of aluminum alloys, and the stress corrosion sensitivity of friction stir welding is lower than that of fusion welding.
It is generally believed that the 6061-T6 and 3004 aluminum alloys that are properly treated will not exhibit SCC. The metallurgical factors will change the type of the aluminum alloy surface film, and cause the internal structure of the aluminum alloy to change and the crystal structure changes, which affects the aluminum alloy. The electrochemical behavior and mechanical behavior of the aluminum alloy lead to different susceptibility to stress corrosion of the aluminum alloy.
3. Stress factors Stress factors mainly include load type, load size, loading direction, loading speed, etc. For SCC, the stress direction must be perpendicular to the grain boundary in order to be able to separate them. One of the key factors for stress corrosion is There are stress effects. Different stress effects will produce different effects. Alternating stress and the environment will produce corrosion fatigue. It is usually different from the stress corrosion cracking caused by fixed stress. Usually the result of corrosion fatigue is higher than that of stress corrosion. More serious. In addition, the different loading speed will also affect the sensitivity of aluminum alloy stress corrosion.
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