How should we deal with rust in Sheet Metal Processing in Shenyang in our daily lives? Please refer to the following text.

We all know that rust water often seeps out after phosphating in sheet metal processing, which is a common problem in many sheet metal processing factories. So how to avoid rusting and deal with this problem? Firstly, we need to identify the reasons behind this phenomenon and conduct an analysis.

1. During acid washing, if the acid in the gaps is not neutralized or not completely neutralized, the phosphating treatment may result in incomplete formation of a film that is prone to rust. After coating, rust will extend and overflow into the gaps for a period of time.

2. Strong acid washing, strong alkaline degreasing treatment, residual chemicals in the gaps are neutralized by chemical reactions, and many manufacturers do not clean them with water. This results in white products appearing in the gaps after drying. After coating for a period of time, these white products react chemically with corrosive media in the air at the overflow gaps. This problem often occurs between March and November, and our sheet metal processing methods to avoid rusting are as follows:

1. It is necessary to use weakly alkaline degreasing, which must not contain flake alkali components. The TAL should be controlled at around 15POINT, and the pH should not exceed 13.

The pickling process can be carried out using sulfuric acid pickling, and the pickling time does not need to be too long. The use of phosphoric acid is just right.

3. After pickling, please neutralize with 1-2 sodium carbonate.

4. Surface adjustment is achieved by using oxalic acid as a chemical fuel, with a concentration of 1-2 degrees.

5. The acidity of zinc based phosphating treatment should be set at the upper limit, and immersion treatment should be attempted: TA： Above 35, FA: 1.2AC: 8 (20cm fermentation tube).

6. All water washing projects do not need to be cleaned thoroughly, and water washing should maintain overflow.

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