一、龟裂（ALLIGATORING）

 

1．描述（Description）:

非常大的裂痕或裂口，看起来类似于乌龟的背甲和鳄鱼的皮肤。裂纹甚至可能直达基材表面。

Very large checking or cracking which resembles the skin of an alligator or crocodile. Cracks may penetrate through to the undercoat down to the substrate.

 

2．可能原因（Probable Causes）:

这通常由膜厚过大和油漆柔韧性有限引起，也可在软底硬面漆膜上发现。涂层间内应力作用导致的漆膜表面收缩速度快于漆膜本身。

Internal stresses in the coating where the surface shrinks faster than the body of the paint film. Can be caused by excessive film thickness and limited paint flexibility. Also found on paint films having a soft undercoat with a hard topcoat.

 

3．预防措施（Prevention）:

使用正确的涂料配套和材料；避免施工厚度过大；避免在高温环境下施工。

Use correct coating specification and materials. Avoid excessive thickness. Avoid application at high ambient temperatures.

 

4．修复方法（Repair）:

修复将取决于龟裂的大小和范围。研磨或去除所有受影响的涂层，并重新涂覆合适的底漆和面漆或遵循产品说明书PDS推荐的程序。

Repair will depend upon size and extent of alligatoring. Abrade or remove all affected coats and apply suitable undercoat and topcoat. Follow recommended application procedures.

 

 

来源：Internet

关键词： 涂料龟裂缺陷