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一、龜裂（ALLIGATORING）

1．描述（Description）:

非常大的裂痕或裂口，看起來類似于烏龜?shù)谋臣缀枉{魚的皮膚。裂紋甚至可能直達(dá)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）:

這通常由膜厚過大和油漆柔韌性有限引起，也可在軟底硬面漆膜上發(fā)現(xiàn)。涂層間內(nèi)應(yīng)力作用導(dǎo)致的漆膜表面收縮速度快于漆膜本身。

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．預(yù)防措施（Prevention）:

使用正確的涂料配套和材料；避免施工厚度過大；避免在高溫環(huán)境下施工。

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

4．修復(fù)方法（Repair）:

修復(fù)將取決于龜裂的大小和范圍。研磨或去除所有受影響的涂層，并重新涂覆合適的底漆和面漆或遵循產(chǎn)品說明書PDS推薦的程序。

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.