Document Detail


The hazardous hexavalent chromium formed on trivalent chromium conversion coating: The origin, influence factors and control measures.
MedLine Citation:
PMID:  22541639     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this paper, the effects of processing parameters and constituents of treating-agent on the presence of hazardous hexavalent chromium on trivalent chromium conversion coating were studied. Results showed that shorter immersion time, lower bath pH value as well as lower working and baking temperatures retarded the presence of hexavalent chromium. In addition, the concentration of hexavalent chromium on conversion coatings prepared by the oxalic acid treating-agent was far greater than those on conversion coatings prepared by formic acid and acetic acid treating-agents. Results also indicated that the concentration of hexavalent chromium on conversion coatings was enhanced due to the addition of bivalent cobalt and nitrate anion in treating-agent, especially for oxalic acid conversion coating. However, the addition of hydroxyl compound d-gluconic acid in treating-agent could reduce the concentration of hexavalent chromium effectively. Moreover, a possible formation mechanism of hexavalent chromium on trivalent conversion coating was proposed. Findings of this study provide a better understanding of the formation of hexavalent chromium on trivalent chromium conversion coating and can facilitate the management of trivalent chromium treating-agents and trivalent chromium fasteners.
Authors:
Jinhua Li; Chenlan Yao; Yanbiao Liu; Di Li; Baoxue Zhou; Weimin Cai
Related Documents :
10741829 - Synthesis of antioxidative and anti-inflammatory drugs glucoconjugates.
17768049 - Synthesis and anti-inflammatory activity of 3-(4'-geranyloxy-3'-methoxyphenyl)-2-trans ...
6428879 - The acute inflammatory process, arachidonic acid metabolism and the mode of action of a...
17498849 - N-[2-(5,5-dimethyl-1,3-dioxane-2-yl)ethyl]amino acids: their synthesis, anti-inflammato...
1503599 - 1-phenyl-1h-indazole derivatives with analgesic and anti-inflammatory activities.
15456329 - Nabumetone: therapeutic use and safety profile in the management of osteoarthritis and ...
20028129 - In vitro proteolytic inhibition, polyphenol oxidase activity, and soluble o-diphenols i...
7026609 - Improved streptococcal grouping antisera containing polyethylene glycol.
21956569 - Estimation of chronological age from the racemization rate of l: - and d: -aspartic aci...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-9
Journal Detail:
Title:  Journal of hazardous materials     Volume:  -     ISSN:  1873-3336     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Liquid-liquid extraction of Pu(IV), U(VI) and Am(III) using malonamide in room temperature ionic liq...
Next Document:  Formaldehyde emission monitoring from a variety of solid wood, plywood, blockboard and flooring prod...