The main reasons for mildew or discoloration of aluminum alloy parts are:

1. Slicing oils includes energetic sulfur intense tension professional.

2. In case the PH price of water-dependent decreasing fluid is too higher, custom aluminum parts，you can actually create patina and white-colored locations about the aluminum surface area.

3. Very low rust inhibitor content material and lower oils information.

It can be altered to cutting oils with inactive sulfur severe stress agent select Ami water-dependent decreasing water with lower PH worth or add more efficient copper and aluminum corrosion inhibitors.

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