專業成就飛鴻騰達變頻器6SL3210-1KE24-4UF1世界就在眼前
在金屬表面局部地方出現向深處發展的腐蝕小孔，其余表面不腐蝕或腐蝕很輕微，這種形態成為小孔腐蝕，簡稱點蝕。金屬腐蝕按機理分為化學腐蝕和電化學腐蝕。點腐蝕屬于電化學腐蝕中的局部腐蝕。一種點蝕是由局部充氣電池產生，類似于金屬的縫隙腐蝕。另一種更常見的點蝕發生在有鈍化表現或被高耐蝕性氧化物覆蓋的金屬上。化學腐蝕的基本原理通過原電池原理可以更好地說明電化學腐蝕機理。當2種活潑性不同的金屬（如銅和鋅）浸入電解質溶液，2種金屬間將產生電位差，用導線連接將會有電流通過，在此過程中活潑金屬（鋅）將被消耗掉，也就是被電化學腐蝕。


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