Surface treatment method for silencer internal wall

Abstract

The invention relates to a surface process method for muffler inner wall. It includes the following steps: taking surface adjusting by manganese phosphate to muffler that has plated decorated chromium and the surface adjusting temperature is 40-60 degree centigrade, taking black phosphorization for 10-15 minutes and the temperature is at 95-100 degree centigrade, taking hot washing at 60-80 degree centigrade, and dipping into water 3-5 times; alkali burning to dry at 80 degree centigrade boiling condition, and drying at over 80 degree centigrade condition. Thus, a layer of phosphorization antisepsis film would be formed on the inner wall of muffler. And the decorated chromium would not pollute the bath. The method has the advantages of high efficiency, simple device and low cost.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a method for forming a phosphating film anti-corrosion layer on the inner wall surface of a muffler. Background technique [0002] Usually, the surface treatment of the muffler is done after the outer surface is plated with decorative chrome, and then the inner wall of the muffler is coated with high-temperature paint, or without any anti-corrosion treatment. If there is no anti-corrosion treatment on the inner wall of the muffler, the inner wall of the muffler will rust quickly, causing the muffler to rust from the inside to the outside, or the welding parts inside will be corroded, and the parts will fall off, resulting in abnormal noise of the muffler and greatly reducing the service life of the muffler. While coating the inner wall of the muffler with high-temperature paint (hereinafter referred to as high-temperature paint), although it has anti-corrosion effect, the c...

AI Technical Summary

Problems solved by technology

If there is no anti-corrosion treatment on the inner wall of the muffler, the inner wall of the muffler will rust quickly, causing the muffler to rust from the inside to the outside, or the welding parts inside will be rusted, and the parts will fall off, resulting in abnormal noise of the muffler and greatly reducing the service life of the muffler

While coating the inner wall of the muffler with high-temperature paint (hereinafter referred to as high-temperature paint), although it has anti-corrosion effect, the cost of high-temperature paint is relatively high and the high-temperature paint requires a special paint higher than 650°C. It is equipped with a special person to operate, adding 1 to 3 workers. In addition to the special spray gun, it is also necessary to be equipped with an electric oven at 150-250 ° C to cure the paint layer. Not only the production cost is high, the efficiency is low, but also the inner wall is coated with high-temperature paint. When the coating needs to be repaired or re-plated, the paint layer must be removed by chemical methods. At the same time, when the coating is repaired or re-plated, the residual paint and chemicals will pollute the plating solution. Often only the entire muffler is scrapped, so the inner wall is coated with high-temperature paint. The mufflers cannot be reworked or re-plated.