Abstract
Atmospheric corrosion of various surface finished steels exposed at indoors and outdoors has been studied. Cold rolled, Zn electroplated and Zn hot dipped steels were finished by degreasing, dipping in a rust preventive oil, atomizing in a rust preventive reagent, conversion-treating and dipping in a rust preventive oil, and enamel coating. These specimens were exposed at five environments such as air-conditioned office and a roofed parking lot in a plant for 1100 days, and inspected visually.Comparing an indoor corrosion rate with an outdoor one, a degreased cold rolled steel was corroded for a day at outdoors, but later stained for 1100d at an air-conditioned office. As a result, the degreased cold rolled steel was corroded at outdoors approximately 1000 times as fast as at indoors. The difference between the indoor and the outdoor corrosion rate is discussed.
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