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AZ91D鎂合金電偶腐蝕的掃描Kelvin探針研究
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國家自然科學(xué)基金 (50871021)；工業(yè)產(chǎn)品環(huán)境適應(yīng)性國家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目


Galvanic Corrosion Evaluation Behavior of AZ91D Magnesium Alloy Studied by Scanning Kelvin Probe
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    利用掃描Kelvin探針技術(shù)(SKP)研究AZ91D鎂合金與316L不銹鋼偶接件在鹽霧試驗(yàn)中電偶腐蝕規(guī)律。通過在中性鹽霧試驗(yàn)不同周期的表面腐蝕形貌的觀察和伏打電位分布圖的測量結(jié)果分析表明，AZ91D鎂合金電偶腐蝕效應(yīng)與偶接陰陽極的伏打電位差密切相關(guān)，AZ91D鎂合金與316L不銹鋼偶接件存在較大的電位差(約為–1.28 V)，其電偶腐蝕效應(yīng)非常顯著。在鹽霧試驗(yàn)初始階段，腐蝕主要發(fā)生在偶接界面AZ91D鎂合金一側(cè)，該腐蝕區(qū)域的伏打電位增加幅度較大，而316L不銹鋼受到保護(hù)沒有發(fā)生明顯腐蝕。隨著鹽霧試驗(yàn)時(shí)間的延長，AZ91D鎂合金腐蝕加快，腐蝕產(chǎn)物覆蓋區(qū)域不斷擴(kuò)大，24 h鹽霧試驗(yàn)后，偶接件的平均伏打單位差由原始的–1.29 V增加到–1.53 V，AZ91D鎂合金的電偶腐蝕效應(yīng)加大。由于AZ91D鎂合金在鹽霧中生成的腐蝕產(chǎn)物對基體具有一定的保護(hù)作用，當(dāng)腐蝕產(chǎn)物不斷增加并覆蓋表面，偶接件的電位差減小導(dǎo)致AZ91D鎂合金的電偶腐蝕效應(yīng)降低

    Abstract:

    The galvanic corrosion of an AZ91D magnesium alloy coupled with 316L stainless steel using accelerated testing in salt spray fog has been investigated by using the scanning Kelvin probe (SKP) technique. The results show that the galvanic effects for AZ91D magnesium alloys are affected by the potential difference between anode and cathode by analyzing corrosion products and SKP Volta potential maps. The galvanic effect of AZ91D magnesium alloy coupled with 316L stainless steel is very significant during accelerated testing in the initial stage of salt spray fog because the potential difference between AZ91D magnesium alloy and 316L stainless steel is about –1.28 V. The galvanic corrosion occurs mainly in the interface near AZ91D magnesium alloy, and 316L stainless steel has no obvious corrosion. With the salt spray test time increasing, the corrosion of the AZ91D magnesium alloy is accelerated and the coverage area of corrosion products expanded. The Volta potential difference of galvanic sample increases from –1.29 V to –1.53 V after 24 h salt spray test. The galvanic corrosion effect of AZ91D magnesium alloy is increased. The corrosion products of AZ91D magnesium alloy have a protective effect. The galvanic corrosion effect is reduced when the corrosion product increases to cover the surface of the specimen

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肖 葵,董超芳,李曉剛,魏 丹. AZ91D鎂合金電偶腐蝕的掃描Kelvin探針研究[J].稀有金屬材料與工程,2011,40(9):1589~1593.[Xiao Kui, Dong Chaofang, Li Xiaogang, Wei Dan. Galvanic Corrosion Evaluation Behavior of AZ91D Magnesium Alloy Studied by Scanning Kelvin Probe[J]. Rare Metal Materials and Engineering,2011,40(9):1589~1593.]
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  • 收稿日期:2010-09-01
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