A comparison of the corrosiveness of indoor atmospheres

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Abstract
The exposure of sets of small test specimens in 45 different atmospheres, principally indoors in factories, has provided a measure of the relative corrosiveness of the atmospheres in such places. The test specimens were of bare low‐alloy and mild steels and mild steel sprayed with aluminium or with zinc.The most corrosive indoor atmospheres investigated were those where large quantities of acids were used, and those of a bleach‐house, a plating shop and a glue extraction plant. Several were more corrosive than the atmosphere outdoors at Sheffield, particularly towards the metal coatings. Although aluminium protected the steel better than did zinc when freely exposed outdoors in industrial atmospheres, a zinc coating was much superior to an aluminium one in many of the indoor atmospheres. High humidity was associated with rapid corrosion rates but corrosion was slow in relatively clean but humid atmospheres, such as were found in a laundry, domestic kitchens and bathrooms.

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