How to deal with the alkali corrosion of steel castings
There are many kinds of chemical elements in steel castings. In addition to free silicon, there are many kinds of compounds and other inclusions. The structure of the steel casting is relatively loose, so there will be some phenomenon that the chemical composition segregation is not uniform enough. When cooling after casting, the unprocessed surface will directly form a relatively dense oxide film. At this time, how should the steel casting manufacturer handle the alkali corrosion treatment?
Although the time of alkali corrosion is relatively short, the steel castings may not be completely eliminated, mainly because the corrosion speed is relatively fast, which will also cause excessive corrosion of the castings, resulting in corresponding changes in the dimensional tolerance of the castings. In serious cases, the products will be scrapped, wasting human, material and financial resources.
When this happens, we can change the alkaline corrosion procedure to solve the problem. That is, the products can be treated with alkaline corrosion after forming. This method can prevent the products from being scrapped, and it can also help the surface quality after oxidation. Alkali corrosion can effectively avoid over corrosion of products. After alkali corrosion, hydrochloric acid can be used to quickly emit light and replace toxic chemicals, which can not only protect the environment, but also improve working conditions and reduce production costs.