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彩塗鋼板是如何實現防腐的呢？

来源：宝钢彩塗卷 | 發布日期：2023-03-29

彩塗鋼板也是彩鋼板，它是与镀层、预处理层、底漆、面漆共同其作用的结果，我们称之为“彩塗鋼板四位一体防腐体系”。那么彩塗鋼板是如何實現防腐的呢？

彩塗鋼板

彩鋼板的鍍層起到犧牲性防腐的作用，簡單來說就是通過不斷消耗自己的鍍層來延長鋼板的使用壽命，當然，鍍層的種類、質量和厚度是鍍層消耗時間長短的關鍵因素。桐蒙彩塗板主要采用國內大型鋼廠鍍鋅、鍍鋁鋅、鍍鋅鋁鎂等鍍層鋼板，強度更高，耐窩蝕性能更好。

我們再來說說預處理層，這是彩鋼板防腐很關鍵的一環，這一環往往很容易被忽略掉。預處理層也叫鈍化層，就是在彩塗之前，需要采用磷酸鹽或鉻酸鹽等鈍化液，對基板表面進行鈍化處理，一方面起到增加塗層的附著力的作用，另一方面起到抗窩蝕的作用。有研究表明，在鍍鋅彩塗板的耐中性鹽霧實驗中，預處理層質量的貢獻率達到了60%以上。

再來說說底漆，底漆一方面起到增加塗層附著力的作用，漆膜透水後，不會發生塗層脫附，防止塗層起泡脫落；另一方面，由于底漆中含有如鉻酸鹽等緩釋顔料，可以使陽*鈍化，提高塗層的耐腐蝕性。

*後我們來說說面漆，面漆除了美觀外，主要起到遮蔽太陽光，防止紫外線對塗層的破壞。面漆達到一定厚度後，可以減少微孔的産生，進而起到屏蔽腐蝕介質滲透的作用，降低塗層的透水和透氧性，防止塗層腐蝕。不同塗層的抗紫外線和致密程度不一樣，就同品種塗層而言，漆膜厚度是影響腐蝕的關健因素。阿彩塗板選擇品牌塗料經高溫固化而成，耐腐蝕性能更優異，抗褪色性能更特久。

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