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(NH4)2SO4 is abundant in the dust of the rural and industrial atmosphere, by which a thin layer of (NH4)2SO4 solution will be formed on the copper surface and give rise to serious corrosion as soon as the ambient humidity gets the critical relative humidity. In this work, the corrosion mechanism of copper in (NH4)2SO4 solution was studied by microgravimetry associated with SEM/EDS, FT‐IR, XRD, titration...
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