How to avoid the aluminum die-casting get blackened ? When after shot blasting of aluminum die-casting is kept in the open.

After shot blasting of aluminum die-casting is kept in the open, it gets blackened. What is the solution to avoid this?

I am not exactly sure what are experiencing but here is my two cents worth.

Usually after shot blasting , the parts is no rust, so more easy oxidation .So will be black.

First, I would something a little less aggressive, glass beads or walnuts for blasting the aluminum with.

Second, it sounds like a thick layer of oxide is forming. Do you live a humid environment. Humidity would cause a thick oxide to form on the fresh surface faster than a dryer environment.anodize the part. or use powder coating ,both cost is more expensive then shot blasting .and powder coating is cheaper then anodize . and in ourdoor , we always choose powder coating process.

Third, When you shot blasting the aluminum die-casting or other parts , you will sealing package or painting immediately .

Fourth,you can paint rust-preventative oil.

Above are my opinion ,if you want to know more information ,you can call me or visit our website.

Before shot blasting gear parts:

After shot blasting gear parts:

Mayflay 's product are 5 categories :

1. Shot peening machine.

2. Shot blasting machine.

3. Sand blasting machine.

4. Sand blasting room .

5. Dust collector.

Welcome everyone to ask and visit us ! Thanks.

Company: Mayflay Machinery (Huizhou) Co.,Ltd

美弗莱机械设备（惠州）有限公司

ADD:Gaolian section, Xinfeng village, Xinxu town, Huiyang district,

Huizhou city, Guangdong, China.