Corrosion Control of Type 316L Stainless Steel in Sulfamic Acid Cleaning Solutions

An investigation was conducted to better understand the corrosion behavior of Type 316L (UNS S31603) stainless steel in sulfamic acid (NH2HSO3) cleaning solutions and the relative merits of traditional corrosion control strategies. Gravimetric and electrochemical measurements in deaerated and uninhi...

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Bibliographic Details
Published in:	Corrosion (Houston, Tex.) Vol. 65; no. 7; pp. 491 - 500
Main Authors:	KISH, J. R, STEAD, N. J, SINGBEIL, D. L
Format:	Journal Article
Language:	English
Published:	Houston, TX NACE International 01-07-2009
Subjects:	Acid cleaning Analytical methods Anodic dissolution Anodic polarization Applied sciences Austenitic stainless steels Cleaning Cleaning. Degreasing. Pickling Corrosion Corrosion control Corrosion environments Corrosion inhibitors Corrosion prevention Corrosion resistance Corrosion resistant steels Dissolution Dissolved oxygen Duplex stainless steels Electrochemistry Electrode polarization Evolution Exact sciences and technology Gravimetry Hydrogen evolution reactions Kinetics Metals. Metallurgy Passivity Photoelectron spectroscopy Photoelectrons Production techniques Reaction kinetics Stainless steel Sulfamic acid Surface treatment X ray photoelectron spectroscopy Surface cleaning Austenitic stainless steel acid inhibitors Corrosion protection Corrosion inhibitor Surface treatment Corrosion resistance Corrosion Chemical cleaning Stainless steel polarization sulfamic acid Stainless steel-316L
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Summary:	An investigation was conducted to better understand the corrosion behavior of Type 316L (UNS S31603) stainless steel in sulfamic acid (NH2HSO3) cleaning solutions and the relative merits of traditional corrosion control strategies. Gravimetric and electrochemical measurements in deaerated and uninhibited 10 wt% NH2HSO3 at 65°C revealed that corrosion proceeds in an active state and involves hydrogen evolution as the dominant cathodic process. Effective corrosion control attained through passivity can be attained through either anodic polarization or the addition of a chemical passivator (dissolved oxygen in this case). Upgrading to the more corrosion-resistant Type 2205 duplex stainless steel (UNS S32205) was not considered reliable because this alloy exhibited borderline passivity. Electrochemical and x-ray photoelectron spectroscopy (XPS) surface microanalytical measurements revealed that the effective corrosion control attained through the addition of a commercial diethylthiourea-containing organic inhibitor was related to the manner in which the absorbed diethylthiourea inhibits the hydrogen evolution reaction kinetics.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0010-9312 1938-159X
DOI:	10.5006/1.3319152