The atmospheric corrosion of zinc in the presence of NaCl: The influence of carbon dioxide and temperature

Journal Article · Mon May 01 04:00:00 EDT 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1393429· OSTI ID:20080574

Lindstroem, R; Svensson, J E; Johansson, L G

The atmospheric corrosion of zinc has been studied at 4, 22, and 38 C. The samples were exposed to synthetic air with careful control of CO{sub 2} concentration, relative humidity, and flow conditions. The relative humidity was 95%, and the concentrations of CO{sub 2} were <1 and 350 ppm, respectively. Sodium chloride was added before the exposures (0, 14, and 70 {micro}g/cm{sup 2}). Mass gain and metal loss results are reported. As expected, NaCl is corrosive toward zinc, giving rise to heavy pitting. In the absence of CO{sub 2}, the corrosion rate of zinc is independent of temperature. In the absence of CO{sub 2}, zincite, ZnO, is the dominant corrosion product, while zinc hydroxy carbonates and simonkolleite, Zn{sub 5}(OH){sub 8}Cl{sub 2}{center_dot}H{sub 2}O, dominate in the presence of CO{sub 2}. A mechanism is presented that explains the observations.

• Research Organization: Goeteborg Univ. (SE)
• OSTI ID: 20080574
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 147; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
CARBON DIOXIDE
CHEMICAL REACTION KINETICS
CORROSION PRODUCTS
PITTING CORROSION
SODIUM CHLORIDES
TEMPERATURE DEPENDENCE
ZINC