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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Chloride-Stainless Stress CrackingChloride-Stainless Stress Cracking
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11/9/2002 9:00 AM
 
Trying to make decisions on what type of water treatment to use, and we have a wide range of chloride levels coming into our facility. We also have a multitude of various metals in the process. I am looking for data on chloride levels, and any other variants that attribute towards stress cracking in stainless. I would like to see studies, or hard facts. Depending on which treatment company I talk with, each have their own therioes on exceptable levels, but to date I have seen no facts. Thanks, John Gerber-Colgate Palmolive Company
 
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11/9/2002 9:00 AM
 
John: The potential for chloride SCC of the 300 series stainless steels increases with increasing chlorides, stress level and temperature. We consider it dangereous to place a go no-go on chloride levels as a measure of protection, based on their ability to concentrate. Making chloride SCC decisions based on temperature is safer. Typically temperaures > 120F-140F are needed for chloride SCC. Below those temperatures , pitting is a viable corrosion mechanism. Regarding your request for hard facts and results of studies, that is more appropriate for a consulting engagement, based on the time requirements. Also, those "hard facts" and studies need to be interpreted in view of your specific design, environment and operation. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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11/12/2002 9:00 AM
 
Hello John, Agree with Mr. Hendrix. One more thing, chloride influence of corrosion is greater when pH is lower than 7. When neutral, the effect is small.
 
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