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Atmospheric corrosion evaluation of silver coating using simulating technique test

Nasirpouri, F ; Sharif University of Technology | 2004

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  1. Type of Document: Article
  2. Publisher: 2004
  3. Abstract:
  4. A standard simulating technique test was investigated to assess the atmospheric corrosion behavior of silver coating. The rates of formation of corrosion products were measured in the simulating atmospheres of 100% humidity containing SO 2,H 2S and a complex atmosphere consist of SO 2,H 2S and NO 2 gases ,based on the mass increase method. The concentrations of corrosive gases were chosen according to real world conditions. XRD, SEM and EDS were used to examine the morphology and to determine the composition of the corrosion products under different experimental conditions. Results revealed the formation of Ag 2SO 4 and Ag 2S on the silver coating surfaces in the SO 2 and H 2S containing atmospheres, respectively. However, both of these corrosion products were detected on the coating surface exposed to the complex atmosphere. Information on the mechanism of corrosion process was obtained, which showed that SO 2 accelerates the corrosion rates by interaction of sulphate with the sulfide film. Also, the addition of NO 2 gas showed a synergistic effect on the sulfidation behavior
  5. Keywords:
  6. Atmospheric corrosion ; Hydrogen sulfide ; Silver coating ; Sulfur dioxide ; Synergistic effect
  7. Source: European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, EUROCORR 2004, Nice, 12 September 2004 through 16 September 2004 ; 2004