corrosion of silver and corrosion of copper
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The corrosion rate of copper in laboratory tests is shown to be a sensitive function of relative humidity, sulfur dioxide, hydrogen sulfide, ozone, hydrogen chloride, and chlorine concentrations. Observed indoor corrosion rates obey log normal statistics over the field population of this study. Also, the observed indoor rates correlate reasonably well with the measured reduced sulfur concentrations (,  ). The corrosion rate of silver is shown not to be humidity dependent. Hydrogen sulfide, ozone, chlorine, and hydrogen chloride concentrations substantially influence its corrosion rate. The observed indoor rates obey log normal statistics and correlate well with the reduced sulfur gas concentration. In contrast to copper, where indoor rates are 1% of outdoor values, silver often corrodes faster indoors than outdoors. Its sensitivity to sulfur gases and insensitivity to relative humidity is proposed as a plausible explanation for these findings. It is proposed that metallic silver is stable in polluted acidic atmospheric environments and therefore is the dominant surface species while cu2O is present on the surface of copper. The thermochemistry and kinetics of these two surfaces will control the stability of silver and copper, respectively, in the presence of pollutants.
On cold-water piping, pitting and corrosion is often caused by an excess amount of flux residue. The excess flux gets carried through the pipe and deposited along the way, pitting the interior.
On cold-water piping, pitting and corrosion is often caused by an excess amount of flux residue. The excess flux gets carried through the pipe and deposited along the way, pitting the interior.
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corrosion of silver : silver ornament (silver articles) gradually turn black due to the formation of a thin silver sulphide layer on the surface by the action of hydrogen ,sulphide gas present in air
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corrosion of copper : when a copper object remain in damp air for a considerable time then copper react slowly with the carbon dioxide and water of air to form a green coating of basic cooper carbonate on the surface of the object the formation of this green coating on the surface of copper object corodes it
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corrosion of silver : silver ornament (silver articles) gradually turn black due to the formation of a thin silver sulphide layer on the surface by the action of hydrogen ,sulphide gas present in air
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corrosion of copper : when a copper object remain in damp air for a considerable time then copper react slowly with the carbon dioxide and water of air to form a green coating of basic cooper carbonate on the surface of the object the formation of this green coating on the surface of copper object corodes it
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