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Abstract
The atmospheric corrosion by SO2 has been simulated in the laboratory using a pollution gas box, PGB, which is described. Both two-electrode galvanic cell type atmospheric corrosion monitors, ACMs (Zn/Fe, cast Zn-55% Al/Fe, rolled Zn-55% Al/Fe), and three-electrode electrochemical cell type ACMs (Zn, Fe, cast Zn-55% Al, rolled Zn-55% Al) have been constructed using techniques modified from those available in the literature. Techniques for carrying out PGB experiments on metal samples in flowing laboratory air containing 0–1 ppm [SO2] are described. Techniques for weighed sample mass loss and ACM electrochemical tests (galvanic current, impedance, corrosion current) are given along with examples of typical electrochemical results. Methods for calculating mass loss from these electrochemical tests are indicated.
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