加壓摩卡壺底座內壁髒污 - 咖啡討論
By Christine
at 2018-11-12T08:47
at 2018-11-12T08:47
Table of Contents
Al 鋁的表面是 Al2O3 氧化鋁，很緻密，會保護內層的鋁不再繼續氧化。但是，Al 是兩性化合物，Al2O3 碰到 NaHCO3 小蘇打 會變成 Al(OH)3 氫氧化鋁，而Al(OH)3可溶於水變成 Al3+ & OH- 離子被水帶走。所以你用小蘇打洗完之後用水清洗，剛好把表面的Al2O3清掉，沒了Al2O3 鋁的保護，那些局部的地方裸露出來的活性很大的 Al 鋁和殘留的水漬中的水和鈣鎂離子産生氧化還原反應，於是表面就產生了均勻度不一的 Al2O3 氧化鋁、CaO 氧化鈣 這些物質，就是你照片中看到的東西。
放心，無毒！
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Sent from JPTT on my iPhone
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放心，無毒！
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Sent from JPTT on my iPhone
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