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The effect of heat on passivated parts

2002

I have been getting corrosion problems with a 2-part assembly that is soldered together. One part is made of 302SS and the other 303SS. Both parts are passivated. Before soldering, the parts are cleaned in acetone [on eBay or Amazon]. After soldering, the assembly is thoroughly cleaned (soldering flux neutralized, flux residue removed, there is a final acetone [on eBay or Amazon] wash). The assembly is finally air-dried.

Our soldering torch reaches 2000-2500 degrees F. What is the effect of heat on passivation? Can sufficient heat undo passivation?

Matthew Maher
- Worcester, Massachusetts

Soldering will DEFINITELY affect the passivation greatly. You must passivate the final assembly after welding and cleaning the weld. Since 303 is in use here, you also have the possible problem of sulfur discoloration. What kind of solder are you using? This can also be a problem. There are products to take care of the sulfur problem. Contact us if we can help.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2002

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