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跳至主要內容 電位差腐蝕 是當兩種不同金屬接觸後，由於不同金屬之間的電位差 所產生的反應，此反應會造成低標準還原電位差的金屬生鏽，此反應也稱作”伽凡尼腐蝕”。
這伽凡尼腐蝕在生活中比較常見的是海邊的金屬，較具低標準還原電位差的金屬容易腐蝕。例如：在海洋工程中，以鉛-錫合金銲接黃銅，因為鉛-錫合金的電位序較具陽極性，所以鉛-錫合金較易受腐蝕，幾乎所有的兩相合金其腐蝕抵抗力都較單相金屬為差。
電位差意思 電位差即進行還原反應的物質「氧化劑」對電子的拉力，因為還原反應程序必須在陰極，氧化反應程序必須在陽極，所以在陽極端的為”被腐蝕端”，在陰極端的為”被還原端”。
金屬電位差 金属越容易失去電子，就越活潑，還原能力就越強。
金屬與水溶液接觸時發生的腐蝕比較複雜，其腐蝕作用常常深入金屬內部。由於溶液通常是電解質，金屬和這樣的水溶液接觸時，產生了電化學作用。
純金屬在空氣中幾乎是不腐蝕的，甚至像Fe這樣的金屬在純淨狀態下也不生鏽。然而工業用金屬常含有各式各樣的雜質，雜質的存在是造成金屬腐蝕的原因之一。
Post navigation error: 內容被保護囉~無法複製 !!
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