Method for the thermochemical passivation of stainless steel
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jun 3, 2010
app pub date -
Feb 22, 2008
filing date -
Mar 5, 2007
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Abstract
The present invention relates to a process for improving the heat and corrosion resistance of stainless steel by means of a novel passivation process. This process comprises a chemical treatment with an aqueous solution comprising a complexing agent combination of at least one oxidant, a subsequent rinsing and a subsequent treatment at elevated temperature in an oxygen-containing atmosphere. The stainless steel surfaces obtained according to the invention have a homogeneous passive layer having increased chemical resistance and resistance to thermal discoloration.
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