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A compilation of corrosion studies of brazed aluminium heat exchangers after field service

机译：现场服务后钎焊铝制热交换器的腐蚀研究汇编

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Sapa Technology has completed an extensive corrosion study of different heat exchangers collected from damaged cars in south Sweden. Much laboratory accelerated testing has been done on automotive heat exchangers and the modes and extent of corrosion in this situation are well known in the industry. However, publications describing the field performance of heat exchangers other than the radiator are absent from the open literature. It was partly to redress this situation and partly to gather data on all heat exchanger performance in a Northern European environment that the present investigation was undertaken. Sets of corroded heat exchangers were retrieved from cars which had been in service in Southern Sweden for 2 to 10 years. The package collected included the radiator, evaporator, condenser and in a few cases the charge air cooler. The heat exchangers contained a variety of material types representing a cross-section of those presently in use. A complete metallurgical examination was performed to define the modes of corrosion developed in the field and to examine the relationship between field corrosion and accelerated laboratory testing. It was found that all the heat exchangers retrieved showed substantially satisfactory field performance without any catastrophic failures. The heat exchanger that suffered the worst corrosion was the condenser with some heavy attack at the braze joints. The radiators showed mainly only light attack and internal corrosion was negligible except in the AA6000 series tubes which showed quite severe internal and external corrosion. No evidence of corrosion was found on evaporators. Of four charge air coolers examined, only one showed light corrosion.
机译：萨帕技术公司已经完成了对从瑞典南部损坏的汽车中收集的各种热交换器进行的广泛腐蚀研究。在汽车热交换器上已经进行了许多实验室加速测试，在这种情况下腐蚀的方式和程度在行业中是众所周知的。但是，公开文献中缺少描述散热器以外的热交换器的现场性能的出版物。进行本研究的部分原因是纠正这种情况，部分是收集有关北欧环境中所有热交换器性能的数据。从在瑞典南部使用2到10年的汽车中回收了几套腐蚀的热交换器。收集的包装包括散热器，蒸发器，冷凝器，在某些情况下还包括增压空气冷却器。热交换器包含各种材料类型，代表了目前使用的材料的横截面。进行了完整的冶金学检查，以定义现场腐蚀的模式，并检查现场腐蚀与加速实验室测试之间的关系。发现所有回收的热交换器均显示出令人满意的现场性能，而没有任何灾难性的故障。腐蚀最严重的换热器是冷凝器，在钎焊接头处有严重的腐蚀。散热器只显示出轻微的光腐蚀，而内部腐蚀则可以忽略不计，但AA6000系列灯管的内部和外部腐蚀非常严重。在蒸发器上未发现腐蚀迹象。在检查的四个增压空气冷却器中，只有一个显示出轻度腐蚀。

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