Two factors that can have a corrosive effect on aluminium sheets

In addition to the environmental factors we mentioned last time, there are two other factors that can have a corrosive effect on aluminium sheets, let's take a look at them together.

1, metallurgical factors

Metallurgical factors mainly include casting methods, processing methods and thermal processing gold stress corrosion impact, found that cathodic polarization of aluminum plate stress corrosion sensitivity increases, friction stir welding stress corrosion sensitivity than the low fusion welding.

It is generally accepted that corrosion will not occur with properly treated 6061-T6 and 3004 aluminium plates. The different metallurgical factors change the type of aluminum plate exterior film and cause different internal organization and changes in crystal structure, which affects the electrochemical behavior and mechanical behavior of the aluminum plate, resulting in different stress corrosion sensitivity of the aluminum plate.

2, stress factors

Stress factors mainly include the type of load, load size, loading direction, loading speed, etc.. In terms of corrosion, the stress direction must be perpendicular to the grain boundaries in order to be able to separate them. One of the key factors in the occurrence of stress corrosion is to have the role of stress. Different stress effects will produce different effects, alternating stresses and the environment together to occur corrosion fatigue, and fixed stresses occurring in the stress corrosion rupture is usually significantly different. Usually corrosion fatigue has more serious consequences than stress corrosion occurs. In addition, differences in loading rates can also affect the susceptibility of aluminium plates to stress corrosion.

The above factors often interact with each other, and even if a simple treatment process can protect the aluminium sheet from corrosion in one environment, it is difficult to avoid corrosion in the other two. Therefore, it is necessary to consider the environment in which the aluminium sheet is used in a holistic manner and to do a good job of corrosion prevention.