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什么是玻璃“發(fā)霉”
來源:www.szkingly.com 發(fā)布時間:2019-12-03


玻璃是我們生活中非常常見的一種東西,但是看到玻璃發(fā)霉的卻很少,因為他們覺得這東西就不會發(fā)霉,或者即使發(fā)霉都看不出來,以為那些霉點是污漬而已。因此,許多人都會對玻璃也會發(fā)霉?這句話有疑問和好奇。沒錯,玻璃它是會發(fā)霉的,如果沒經驗,很多會誤認為是污漬。

玻璃發(fā)霉俗稱玻璃風化

玻璃發(fā)霉俗稱玻璃風化,這是由于在儲存、運輸過程中,玻璃及玻璃制品表面接觸到了水和空氣,然后發(fā)生一系列復雜的物理,化學變化,然后使得玻璃的表面收到腐蝕。玻璃發(fā)霉主要表現為在其表面形成白斑,彩虹或者霧狀物等,影響玻璃光滑度,透明度降低,個別嚴重的還會有發(fā)生粘片。

玻璃發(fā)霉也就是由于玻璃的表面受水氣侵蝕造成的,我們來分析造成這一現象的原因,通常情況下,是有以下兩種原因造成:一是板面的析堿,另一個就是板面被霉菌侵蝕,但其本質上都是水氣侵蝕玻璃引起。

玻璃發(fā)霉俗稱玻璃風化

玻璃的主要成分為二氧化硅,本身就具有較高的化學穩(wěn)定性,可表面接觸了水氣,就會發(fā)生一系列的化學反應并開始在玻璃表面發(fā)生感官上的變化,比如失去光澤,表面晦暗,甚至出現油脂狀薄膜和斑點等霉變現象。玻璃的生產工藝,堿金屬和堿金屬離子富集于玻璃表面,這些金屬離子是玻璃的網絡外體,化學性質比較活潑,如果遇見水,玻璃中的堿金屬離子就會和水腫的氫離子進行離子交換,鈉離子將被氫離子取代,生成氫氧化鈉強堿物質,玻璃的表面水溶液就變成了堿性。

當水長期作用于玻璃時,即使是少量的,水溶液的堿性也會增大,腐蝕力增強,這個時候玻璃的整個網絡收到強堿侵蝕,它的氧橋骨架斷裂,表面受到侵蝕,表現會出現彩虹,白斑,霧狀物,甚至是發(fā)生粘片。

因此,在玻璃生產的配料中金屬氧化物越多,鈉離子富集區(qū)越大,非橋陽離子就越多,西城Si-O-Na型結構的可能性越大,霉變可能性越大。所以,通常情況下茶色、綠色、藍寶石色等各種顏色玻璃比普通平板玻璃更容易發(fā)霉。目前,對于玻璃發(fā)霉問題,一般采用玻璃防霉紙包裝法、二氧化硫氣熏法、噴防霉劑法、添加防霉粉法。其他的還有靜電噴粉、氣體霧化噴粉等多種。



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