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Industry News

Wheel coating process and common problems

更新时间：2021-08-11 浏览：51

1. Wheel coating process:

On a domestic large-scale wheel production line, the coating process of wheels is: topping, pre-degreasing (spraying), degreasing, washing, washing, pickling (hydrochloric acid), washing, washing, washing, neutralization, washing, surface adjustment, Phosphating, water washing, water washing, water washing, pure water washing, pure water washing, cathodic electrophoresis, 0 times UF water washing, UF1 water washing, UF2 water washing, pure water washing, pure water washing, baking, next part (transfer surface coating line). The whole line adopts continuous assembly line production, the immersion tank is a boat-shaped tank, and the pre-treatment, electrophoresis, and drying channel form a circulating conveying system, that is, sharing a conveying chain.

2. Common problems in painting

The problem of blistering and returning rust in the wheel gap: On the production line, the phosphate film on the wheel gap and welding seam often returns to rust, and the phosphate film is incomplete. After electrophoresis, paint film blisters or paint residue-like substances appear in the cracks of the wheels. In addition, when the wheels after electrophoresis are left outdoors for a long time, yellow rusty water sometimes flows out from the gap between the wheels. In production, the smaller the wheel gap, the more likely to have such problems.

1 Reason analysis: (1) Incomplete degreasing; (2) The influence of residual acid radical ions; (3) Phosphating aspect:

2 Improvement measures: (1) Improve the degreasing effect; (2) Strengthen the water washing of the workpiece after degreasing