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51312-01394-Deposit-Assisted Corrosion of Automotive Flexible Connector Alloys

Picture for Deposit-Assisted Corrosion of Automotive Flexible Connector Alloys
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Product Number: 51312-01394-SG
ISBN: 01394 2012 CP
Author: Matthew D. Bender
Publication Date: 2012
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The development of new alloys for hot automotive exhaust components provides the automotive industry an improved opportunity to select an optimal alloy with sufficient corrosion resistance for a given application at an acceptable cost. Not only is an exhaust flexible connector exposed to high-temperature exhaust gases found in combustion and to the cyclic environment of engine operation but the bellows 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.
The development of new alloys for hot automotive exhaust components provides the automotive industry an improved opportunity to select an optimal alloy with sufficient corrosion resistance for a given application at an acceptable cost. Not only is an exhaust flexible connector exposed to high-temperature exhaust gases found in combustion and to the cyclic environment of engine operation but the bellows 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.
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