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首页> 外文会议>Corrosion conference and expo >Influence of temperature, test duration, and water content on dry corrosion of aluminum (EN AW-1050, EN AW-3103, EN AC-46000) in alcohol blended fuels
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Influence of temperature, test duration, and water content on dry corrosion of aluminum (EN AW-1050, EN AW-3103, EN AC-46000) in alcohol blended fuels

机译：温度，测试持续时间和含水量对酒精混合燃料中铝的干腐蚀（EN AW-1050，EN AW-3103，EN AC-46000）的影响

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Gasoline is blended with alcohols of biogenous origin, such as ethanol or methanol, in order to reduce CO_2-emissions. The use of these fuels containing alcohol can affect the vehicle reliability due to an incompatibility with the utilized materials of the fuel system. For aluminum alloys in contact with water-free alcohol blended fuels, a chemical corrosion at high temperatures is of special interest, the so called alkoxide or dry corrosion. Previous investigations reveal that the temperature has to be regarded as the key element controlling the possibility of dry corrosion. A higher amount of dry alcohols, like ethanol, leads to higher corrosion sensitivity on aluminum and its alloys. In other words, higher contents of dry ethanol lower the temperature of dry corrosion. In this study, the influence of the temperature on dry corrosion was investigated by immersion tests in pressurized vessels. As a result the threshold temperatures, which characterize the maximum allowable temperature without occurrence of dry corrosion, were defined for several aluminum materials dependent on the alcohol content. Within the test results the lowest allowable temperature was determined for the cast alloy EN AC-46000 in E85 (85% ethanol content) at 60 °C. The determined temperatures were verified by longer test durations up to 4 weeks. Furthermore, the results show a correlation between the size of sample area compared to the liquid volume. The inhibiting effect of water was examined, as the dry corrosion could be prevented up to temperatures of 140 °C.
机译：汽油与生物来源的醇（例如乙醇或甲醇）混合，以减少CO_2排放。这些含酒精的燃料的使用会由于与燃料系统的所用材料不兼容而影响车辆的可靠性。对于与无水酒精混合燃料接触的铝合金，高温下的化学腐蚀尤为重要，即所谓的醇盐腐蚀或干式腐蚀。先前的研究表明，必须将温度视为控制干腐蚀可能性的关键因素。大量的干醇（如乙醇）会导致对铝及其合金的腐蚀敏感性更高。换句话说，较高含量的干燥乙醇会降低干燥腐蚀的温度。在这项研究中，通过在压力容器中进行浸没试验研究了温度对干腐蚀的影响。结果，根据酒精含量，定义了几种铝材料的阈值温度，该阈值温度代表最高允许温度而没有发生干腐蚀。在测试结果中，确定了铸造合金EN AC-46000在60°C下E85（乙醇含量为85％）中的最低允许温度。所确定的温度通过长达4周的更长测试持续时间进行了验证。此外，结果显示样品区域的大小与液体体积之间的相关性。检查了水的抑制作用，因为可以防止高达140°C的干腐蚀。

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