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鍍鋁鋅彩鋼板的防腐性能如何

来源：宝钢彩塗卷 | 發布日期：2022-06-09

鍍鋅板可分爲電鍍鋅和熱浸鍍鋅兩種方法。電鍍鋅法是用電沈積法在鍍金板上鍍一層鋅金屬或鋅合金。熱浸鍍鋅，又稱熱浸鍍鋅，是將被保護的金屬制品浸入熔融的鋅金屬中，在其表面形成保護性金屬塗層。與電鍍相比，熱浸鍍鋅層更厚；在同樣的環境下，它的壽命更長。鋅在大氣中的腐蝕過程與鋼在大氣中的腐蝕過程相似。鋅表面發生化學氧化腐蝕和電化學腐蝕，並伴有水膜凝結。

彩钢板

在中性或弱酸性的大气环境下，钢板镀锌层经腐蚀后形成的腐蚀产物为非溶性化合物（氢氧化锌、氧化锌和碳酸锌），这些产物将以沉淀形式析出，形成致密的薄层，一般可达8 u m”的厚度。这种薄膜既有一定厚度，又不容易溶解于水，附着性又很强。因此它能起到大气与镀锌板之间的屏障作用，防止腐蚀的进一步发展。在保护镀锌层遭到破坏。钢铁部分表面暴露于大气环境中，此时锌与铁形成微电池，锌的电位明显低于铁的电位，锌则作为阳*对钢板基板起到牺牲阳*的保护作用，防止钢板的腐蚀发生。

彩塗鍍鋁鋅板則是將液態塗料，用刷塗或輾塗法塗覆在清潔的金屬表面，加溫固化後可得到石同厚度的漆膜。漆膜的作用除了把金屬與腐蝕介質隔開外，還可以借助于塗料中的某些顔料（如鉛丹、鉻酸鋅等）使金屬鈍化,達到**性防腐的效果。從彩色塗層鋼板的防腐機理來看，有機塗層（包括固塗層和底塗層）是一種隔離性的物質，它將基板與腐蝕介質隔離開來，以達到防蝕的作用。

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