Stainless steel acid treatment
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United States of America Patent
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Jun 16, 1998
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N/A
app pub date -
Apr 21, 1997
filing date -
Sep 26, 1994
priority date (Note) -
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Abstract
The invention includes a method for cleaning and passivating a stainless steel surface comprising: 1) contacting the surface with 1548 ml/liter of an acid formulation comprising between about 1 and 60% acid component, about 1-15% surfactant, and between about 39 and 98% water; 2) maintaining contact to dislodge and remove residue from the surface; 3) continuing contact to complex free iron ions liberated from the surface to form an oxide film on the surface; and 4) continuing contact to precipitate the complexed ions into the oxide film.
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