包装材料の腐食作用に関する研究 (第3報)

鉄鋼の錆発生度との関連における包装材料中の腐食性因子の定量的考察

抄録

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.