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Effect of impurity elements in recycled aluminum on corrosion behavior

再生铝中杂质元素对腐蚀行为的影响

基本信息

批准号：
06650790
负责人：
TAGASHIRA Kousuke
金额：
$ 1.34万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Investigations have been made the relation between concentration of dissolved oxygen in a beverage solution in Japanese market and pitting attack of aluminum alloy 5182. The value of anodic polarized resistance of 5182 was measured by the area polarization technique in a drink solution environment of which dissolved oxygen concentration was continuously changed from 10ppb to 600ppb. It is electrochemically and metallingically found that the value of more than 40ppb dissolved oxygen in the solution leads to that the occurrence of pitting attack of 5182 aluminum alloy. This expectation value of 40ppb coincides with the realistic rupture condition of beverage solution in a market. Dissolution behavior in a 5% NaOH solution for Al-Fe-Si alloys with various different Fe/Si ratio have been investigated. Weight loss of the alloys decrease with decreasing Fe/Si ratio in the alloys. Dissolution process at the NaOH etching treatment is controlled by the cathodic reaction of water reduction. It i … More s electrochemically found that the intermetallic compounds with lower Fe/Si ratio in the alloys cathodically plays poor role in the etching process. Electrochemical measurements and metallurgical observations have been made to clarify the effect of NaCl concentration on the corrosion behavior of the intermetallic compounds such as FeA13 in aluminum. The autocatalytic nature that are preferential dissolution of iron in the intermetallic compounds and subsequently deposition of ferrous iron to metallic iron occurs in the dilute NaCl solution environment (<1.0M NaCl). The intermetallic compounds in the concentrated NaCl solution environment (>3.0M NaCl), however, always provide the cathodic sites at which the well-known oxygen reduction reaction takes places. It is explained that dissolution possibility of the intermetallic compounds is depend on the variation of the corrosion potentials ; the pitting potentials are equal to the corrosion potentials related to the concentrations of NaCl solutions. Less

研究了日本市场饮料溶液中溶解氧浓度与铝合金5182点蚀的关系。在溶解氧浓度从10ppb到600ppb连续变化的饮料溶液环境中，采用面极化技术测量5182的阳极极化电阻值。电化学和金属学发现，溶液中溶解氧值超过40ppb会导致5182铝合金发生点蚀。这个40ppb的预期值与市场上饮料溶液的实际破裂情况相符。研究了不同 Fe/Si 比的 Al-Fe-Si 合金在 5% NaOH 溶液中的溶解行为。合金的重量损失随着合金中Fe/Si比率的降低而降低。 NaOH蚀刻处理中的溶解过程由水还原的阴极反应控制。电化学发现合金中Fe/Si比较低的金属间化合物在蚀刻过程中的阴极作用较差。通过电化学测量和冶金观察，阐明了 NaCl 浓度对铝中 FeA13 等金属间化合物腐蚀行为的影响。在稀 NaCl 溶液环境（<1.0M NaCl）中，自催化性质发生在金属间化合物中铁的优先溶解以及随后二价铁沉积为金属铁。然而，浓氯化钠溶液环境（>3.0M 氯化钠）中的金属间化合物始终提供发生众所周知的氧还原反应的阴极位点。说明金属间化合物溶解的可能性取决于腐蚀电位的变化；点蚀电位等于与 NaCl 溶液浓度相关的腐蚀电位。较少的