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钣金加工件喷漆出现针孔的原因及其解决方法

2018-05-25 21:46:47 常州亿创钣金加工厂 阅读

针孔

定义:针刺状小孔,深及中间漆。

成因:玻璃纤维底材。

聚酯填充料(原子灰)混合不足。

经打磨的表面仍留有溶剂泡。

聚酯填充料(原子灰)打底不足。

预防方法:彻底混合聚酯填充料(原子灰)。

不可打磨溶剂泡,或将问题漆膜完全清除。

填充足够的聚酯填充料(原子灰)。

补救方法:清除有毛病的面漆。

打磨后涂上聚酯填充料(原子灰)。

喷涂上底漆后重新喷涂面漆。

溶剂泡

(痱子、起热痱)

定义:漆面呈现小泡和泡痕。

成因:溶剂空气藏在漆膜内,其后逸出,留下泡痕,常见成因如下:

漆膜喷涂过厚,使用太快干在硬化剂或稀释剂。

喷枪喷嘴(口径)或喷涂粘度或喷涂气压不正确。

加温干燥前静止时间不足或烤漆房气流不足。

预防方法:使用用正确的喷涂粘度、喷涂气压、喷嘴口径。

使用适当的硬化剂和稀释剂。

给予足够静止时间。定时检查烤房内的气压和湿度。

补救方法:烘干后打磨,在受影响的范围重新喷涂中间漆,打磨后再喷面漆.

pinhole

Definition: pinhole, deep and intermediate paint.

Cause: glass fiber base.

Polyester filling (atomic ash) is inadequately mixed.

There is still a solvent bubble on the surface of the mill.

Polyester filler (atomic ash) is not enough to bottom.

Precaution: thoroughly mix polyester filler (atomic ash).

Do not polish the solvent bubble or remove the problem film completely.

Fill up enough polyester filling material (ash).

Remedial method: remove the defective topcoat.

Coat with polyester filling (ash) after grinding.

Spray the primer and re spray the finish.

Solvent bubble

(prickly heat, heat and prickly heat)

Definition: the lacquer surface presents blisters and blister marks.

Causes: solvent air is stored in the paint film and then escapes, leaving bubble marks. Common causes are as follows:

The paint film is sprayed too thick and used too fast to dry in hardener or diluent.

Spray gun nozzle (caliber) or spray viscosity or spray pressure is incorrect.

Insufficient time before heating or drying or insufficient air flow in the paint room.

Prevention: use proper spraying viscosity, spray pressure and nozzle caliber.

Use appropriate sclerosing agent and diluent.

Give enough time to rest. Check the air pressure and humidity in the roast room regularly.

Remedy: Polish after drying, re paint the intermediate paint in the affected area, then polish the top coat.


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