There are generally two reasons for this phenomenon. The first one may be that the artifacts were carried out , not cleaned well or just simple washing . Another is that artifacts are exposed to the humid air for a long time, oxidized.Maybe it is possible to use the release agent not suitable.It is recommended that you should clean the artifacts in time after they were taken out , and keep them in a dry environment, or soak them with corrosion inhibitor as soon as they were taken out. You can use our KZY660 anti-oxidation and mildew die-casting release agent, designed for coastal and southern environment .There will be a great improvement for artifacts turning black ,appearing mildew point.
For more information about How to Deal With the Problem That the Artifacts Turned Black After Being Produced for A While? or die-casting auxiliary materials, and if you need customized die-casting release agent, please contact 15021483232 (same as Wechat)
