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Effect of Temperature on Passivation Process of Aluminum Alloy

2019/9/28 8:59:14 click:

Passivation of aluminum alloy plays a very important role in the process and the temperature plays a very important role in the passivation effect. The influence of temperature exists in the pre-treatment and passivation process. To do a good job of aluminum alloy passivation, the important element of temperature cannot be ignored. Therefore, it is absolutely necessary to discuss the influence of temperature in the passivation process.
First of all, the influence of degreasing temperature on degreasing effect is a factor that must be paid attention to during pretreatment of aluminum alloy passivation process. In order to ensure that the surface of the workpiece is clean and free of grease, the temperature must be controlled during degreasing. The low temperature is not conducive to the activation of the active agent of degreasing agent and the degreasing effect is poor. If the temperature is too high, the active agent in the degreasing agent will decompose due to high temperature, and the activity of the active agent will disappear, resulting in poor degreasing effect.
Secondly, in the passivation process of aluminum alloy, another process affected by temperature is the temperature of passivation solution. The water temperature in southern China is generally between 10-22 degrees. In this temperature range, passivation solution can be used normally, but in special weather or winter in northern China, the water temperature may be lower than 10 degrees. In this temperature range, the passivation effect is relatively poor, so it must be heated.  In addition, in order to improve the corrosion resistance of aluminum alloy, heating can also be adopted, but the maximum temperature is not more than 40 degrees, otherwise, the passivation effect is not good.
It can be seen that temperature is very important in the passivation process of aluminum alloy. It is related to the success and failure of the passivation process and must be paid attention to by potion suppliers and users.
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