Abstract
Kraft papers containing various amounts of Cl- and H+ were prepared in laboratry. A piece of the papers was put between two pieces of mild steel and the corrosive was tested under 40°C, 90% R. H. and room temperature. Corrosive action was evaluated by the measurement of rust degree of iron and steel specified by Japanese Industrial Specification.Results obtained were as follows:1) The allowable limit of Cl- is about 0.4mg per 1g of material and beyond the limit, a proportional relation between Cl- concentration and R was established, where R is rust degree of mild steel.2) The allowable limit of H+ concentration is approx. 6 in pH and in acid range, log R is proportional to pH value.
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