1994 年 45 巻 12 号 p. 1287-1291
Electroless nickel-iron-boron alloy deposits containing dimethylamine boron as a reducing agent were investigated for corrosion resistance in 5wt%NaCl (pH7, 303K) by immersion tests and measurements of external polarization curves and corrosion potential.
The following results were obtained:
(1) At a bath pH of 7 to 11, the corrosion resistance of the deposits improved the higher the pH.
(2) When the iron ion concentration in the bath was changed, while the total concentration of nickel ion plus iron ion was kept at 0.1mol/L, the corrosion resistance of deposits containing iron was better than that of nickel-boron deposite but at greater iron contents, corrosion resistance tended to decreased.