The restoration of the passivity of stainless steel Weldments in pickling solutions observed using electrochemical and surface analytical methods

Xiong, Jianyu, Agarwala, Swati, Tan, Mike Yongjun and Forsyth, Maria 2015, The restoration of the passivity of stainless steel Weldments in pickling solutions observed using electrochemical and surface analytical methods, Corrosion, vol. 71, no. 10, pp. 1248-1256, doi: 10.5006/1830.

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Title The restoration of the passivity of stainless steel Weldments in pickling solutions observed using electrochemical and surface analytical methods
Author(s) Xiong, Jianyu
Agarwala, Swati
Tan, Mike YongjunORCID iD for Tan, Mike Yongjun orcid.org/0000-0002-0765-108X
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Corrosion
Volume number 71
Issue number 10
Start page 1248
End page 1256
Total pages 9
Publisher N A C E International
Place of publication Houston, Tex.
Publication date 2015-10
ISSN 0010-9312
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
electrochemical testing
heat affected zone
localized corrosion
passivity
pickling
stainless steels
weldments
NI-CR ALLOYS
CORROSION
DISSOLUTION
MIXTURES
BEHAVIOR
DUPLEX
Summary In this study, a solution containing ammonium fluoride (NH4F) and nitric acid (HNO3) was used as an alternative to the conventional highly toxic pickling solution HF/HNO3 for pickling weldments of selected stainless steels including Type 316 stainless steel (UNS S31600), duplex stainless steel 2205 (UNS S32205), and super duplex stainless steel 2507 (UNS S32750). Electrochemical and surface analytical methods were used to understand the effects of pickling on the stainless steel weldments. Cyclic potentiodynamic polarization (CPP) test results indicated that the restoration of passivity of stainless steel weldments could be achieved by pickling the weldments in both HF/HNO3 solution and NH4F/HNO3 solutions. Scanning electron microscopy observation of the UNS S32750 weldment surface revealed that both the HF/HNO3 solution and the NH4F/HNO3 solution could remove the heat tint on the weldment. X-ray photoelectron spectroscopy analysis indicated that treatment in these two pickling solutions produced passive films with similar characteristics. Thus, this work suggests that the NH4F/HNO3 solution is a promising alternative to HF/HNO3 solution for the pickling of stainless steel weldments, and that the CPP test approach can be used in conjunction with surface analytical methods for further development of safer and environmentally friendly picklingsolutions.
Language eng
DOI 10.5006/1830
Field of Research 030301 Chemical Characterisation of Materials
091207 Metals and Alloy Materials
091202 Composite and Hybrid Materials
0912 Materials Engineering
0905 Civil Engineering
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, N A C E International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30080184

Document type: Journal Article
Collections: School of Engineering
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