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Deposit-Assisted Corrosion of Automotive Flexible Connector Alloys

机译：汽车挠性连接器合金的沉积辅助腐蚀

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The development of new alloys for hot automotive exhaust components provides the automotive industry an opportunity to select an optimal alloy with sufficient corrosion resistance for a given application at an acceptable cost. Not only is an automotive exhaust flexible connector exposed to high-temperature exhaust gases found in combustion and to the cyclic environment of engine operation, but the bellows component can also be exposed to halide road deicing salts under wet or dry conditions. When hot components are exposed to salts (or ash), deposit-assisted corrosion can be a significant concern because these reactive deposits can disrupt the protective oxide layer and significantly accelerate the elevated temperature degradation of stainless steels and nickel-base alloys. This paper compares the corrosion resistance of established automotive flexible connector alloys (UNS S31635, S35125, N06625), with a newly developed, relatively lean austenitic alloy (UNS S33425), when exposed to chloride-based deposits at elevated temperatures. Such deposits are present in the byproducts of combustion of alternative fuels and are common in some combustion environments such as the environment experienced by hot automotive exhaust components.
机译：用于热的汽车排气部件的新合金的开发为汽车行业提供了一个机会，可以以可接受的成本为给定的应用选择具有足够耐腐蚀性的最佳合金。汽车排气挠性连接器不仅会暴露于燃烧中发现的高温废气中以及发动机运转的循环环境中，而且波纹管部件也可能在潮湿或干燥条件下暴露于卤化物道路除冰盐。当热的部件暴露于盐（或灰分）时，沉积物辅助腐蚀会成为一个重大问题，因为这些反应性沉积物会破坏保护性氧化物层并显着加速不锈钢和镍基合金的高温降解。本文将成熟的汽车挠性连接器合金（UNS S31635，S35125，N06625）与新开发的相对贫化的奥氏体合金（UNS S33425）在高温下暴露于氯化物基镀层时的耐腐蚀性进行了比较。这种沉积物存在于替代燃料燃烧的副产物中，并且在某些燃烧环境中很常见，例如高温的汽车排气部件所经历的环境。

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