抄録
In this report, the experiments were carried on carbon steel, Ni-Cr steel and Cr-Mn steel with respect to the fellowing items: (1) the change of HCl (37%) quantity in the 3% Cu(NH4)2Cl4·2H2O solution, (2) the concentration of Cu••. H• and Cl′, (3) the relation between optimum replica solution, martensite and normal structure.
The used samples are shown in the Table 1 and heat treatment of samples is shown in the Table 2. The results of experiments are shown in the Table 3. On the chemical plating, some relations are found between the ions of Cu••, H• and Cl′ in the replica, solution which varies according to the concentrations of alloying elements in the iron and structure. Substituting the concentration of H• and Cl′ with HCl quantity, these relations has synthetic ions concentration constant on the replacement of martensite. The concentration of optimum replica solution is determined by the change of added HCl quantity, at this case, the concentrations of Cu(NH4)2Cl4·2H2O solution is constant. If the concentration of Cu(NH4)2Cl4·2H2O solution is 3%, martensite is replaced by replica solution, of which HCl quantity increase about 0.1 cc more than in the case of replacement of normal structure. Photo. 1, Photo. 2, Photo. 3 and Photo. 4 show the photographs of replica.
