Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Mobility and mode of inhibition of chromate at defected areas of organic coatings under atmospheric conditions
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
2004 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 60, no 12, p. 1122-1133Article in journal (Refereed) Published
Abstract [en]

The ability of chromate as an anticorrosive pigment incorporated into primer coatings to inhibit the corrosion of galvanized steel has been studied using cell modeling conditions at defects of painted sheets. The experiments were performed at different temperatures (4, 22, and 40° C) and chloride concentrations (1 mmol/L and 10 mmol/L) with coatings releasing from 20 mg/m2 to 100 mg/m2 chromate per 48 h. After 1 h to 48 h of exposure, the solutions were analyzed by ion chromatography (IC) and the metal samples were studied using Fourier transformed infrared (FTIR), energy-dispersive x-ray (EDX), and x-ray absorption near-edge structure (XANES) spectroscopy. The XANES measurements detected the presence of a Cr(III)/Cr(VI) layer containing approximately 15% of Cr(VI) on the initially bare zinc surface. Corrosion of the samples exposed with the chromated primers was clearly inhibited in comparison with blank samples, with an inhibition efficiency ranging from 50% to 95% according to the exposure conditions. Thus, the results showed that chromate was transported from the pigmented primer to the bare metal surface and formed a protective layer on it. Moreover, an enrichment of the pit centers with chromium wasfound with EDX, suggesting the ability of chromate to seek the active, or formerly active, corrosion sites and preferentially adsorb at these locations. The extent of corrosion deterioration of the samples and chromate consumption was regarded with respect to temperature, chloride concentration, total amount of released chromate, and the kinetics of the release. The developed experimental technique was tested on a vanadate system as well. The experimental setup proved to be a simple and efficient tool for future testing of paints, inhibitors, materials, or aggressiveness of environment, as well as for fundamental studies. © 2004, NACE International.

Place, publisher, year, edition, pages
National Assoc. of Corrosion Engineers International , 2004. Vol. 60, no 12, p. 1122-1133
Keywords [en]
Chromate inhibition, Galvanized steel, Inorganic inhibitors, Organic coatings, Protection mechanism, Vanadate inhibition, Chromatographic analysis, Corrosion prevention, Energy dispersive spectroscopy, Environmental impact, Galvanized metal, Pigments, Steel, Anticorrosive pigment, Chromated primers, Ion chromatography, Atmospheric corrosion, coating, Corrosion resistance, organic coating
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-40445DOI: 10.5006/1.3299226Scopus ID: 2-s2.0-11044232290OAI: oai:DiVA.org:ri-40445DiVA, id: diva2:1361022
Note

Cited By :16; Export Date: 10 October 2019; Article; CODEN: CORRA; Correspondence Address: Prosek, T.; Institut de la Corrosion, 220 rue Pierre Rivoalon, 292 00 Brest, France; email: tomas.prosek@institut-corrosion.fr

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus
By organisation
KIMAB
In the same journal
Corrosion
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 2 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.8