| 摘要 |
PROBLEM TO BE SOLVED: To obtain an etching agent for roughening the surface of nickel into a deep rugged shape exhibiting anchor effect in the case of being adhered with a resin by forming it into an aq. soln. contg. ferric chloride, hydrochloric acid and a high polymer compd. having at least either polyamine chains or cationic groups in molecules respectively by the ratios in specified ranges. SOLUTION: The ratio of ferric chloride is 5 to 39 wt.%, that of hydrochloric acid is 0.01 to 2 wt.%, and that of a high polymer compd. is 0.000001 to 1 wt.%. The high polymer compd. is a cationic high polymer compd. showing cationic behavior in an aq. soln., in which molecular weight is desirably several thousands to several millions, and polyethylene imine, polyalkylene polyamine or the like is desirable because of the excellent solubility and low foamability thereof. For obtaining deep ruggedness, etching is executed to a depth of 0.5 to 4μm from the surface of nickel. Ferrous ions produced by the reaction with nickel are returned by air oxidation and recover the etching performance thereof.
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