鋁合金偶接后的大氣腐蝕行為
(1. 北京科技大學(xué) 材料學(xué)院， 北京 100083;
2. 中國(guó)科學(xué)院 金屬研究所 金屬腐蝕與防護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
沈陽 110016;
3. 中國(guó)腐蝕與防護(hù)學(xué)會(huì)， 北京 100083)
摘 要: 研究了AM60鑄造鎂合金與H62銅合金、 LY12鋁合金組成的電偶對(duì)在北京地區(qū)室外曝曬3個(gè)月和6個(gè)月后的大氣電偶腐蝕行為及規(guī)律。 結(jié)果表明： 鎂合金始終是電偶對(duì)中的陽極， 當(dāng)其與H62銅合金和LY12鋁合金偶接時(shí)， 其腐蝕速率增加1~7倍； 鎂合金與H62銅合金偶合后， 其大氣電偶腐蝕效應(yīng)大于其與LY12鋁合金組成的電偶對(duì)的大氣電偶腐蝕效應(yīng)；在6個(gè)月的實(shí)驗(yàn)周期內(nèi)， 隨著曝曬時(shí)間的延長(zhǎng)， 鎂合金在北京地區(qū)大氣環(huán)境中的電偶腐蝕效應(yīng)呈上升趨勢(shì)； 試樣表面潤(rùn)濕時(shí)間短是造成AM60鎂合金在北京曝曬第一個(gè)實(shí)驗(yàn)周期(2003.12~2004.2)的電偶腐蝕低于第二個(gè)由實(shí)驗(yàn)周期(2004.3~2004.5)的主要原因； 北京地區(qū)高自然降塵量對(duì)鎂合金電偶腐蝕將起到加速的作用。
關(guān)鍵字: 鎂合金; 銅合金； 鋁合金； 電偶腐蝕; 大氣腐蝕
magnesium alloy coupled with Cu alloy and
Al alloy
（ 1. College of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, Chinese Academy of Science,
Shenyang 110016, China;
3. Chinese Society of Corrosion and Protection, Beijing 100083, China）
Abstract: The galvanic corrosion behavior laws of AM60 magnesium alloy coupled with H62 brass and LY12 aluminium alloy in Beijing atmospheric environment by exposure for three and six months were investigated respectively. The results show that the magnesium alloys act as anode and their corrosion rates increase by one to seven times when they are coupled with H62 brass and LY12 aluminium alloy. The atmospheric galvanic effect of magnesium alloys coupled with H62 brass is larger than that of the magnesium alloy AM60/ LY12 aluminium alloy. The atmospheric galvanic effect becomes stronger in Beijing with increasing exposure time for the same galvanic couple. For the dry and cold weather of the first test term (Dec, 2003-Feb, 2004), the galvanic corrosion is less than that of the second test term which is of wetness and warmth (March, 2004-May, 2004). The galvanic corrosion of AM60 magnesium alloy is accelerated for the high dust precipitation in Beijing.
Key words: magnesium alloys; Cu alloy; Al alloy; galvanic corrosion; atmospheric corrosion
