Studies on Properties of Electroless Ni-Fe-P Alloy Deposits Reduced by Sodium Hypophosphite:Studies on Electroless Nickel Plating (Part 2)

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In the previous paper, there were reported the studies on electroless Ni-Fe-P alloy plating bath reduced by sodium hypophosphite.This paper reports on properties of the deposits obtained from the previous plating baths. The following results were obtained.(1) In the deposits from the caustic alkaline citrate bath at pH=9 (C-C-9), nickel component was in amorphous state and iron consisted of fine crystals of α-iron. Whereas, in the deposits from the ammoniacal alkaline citrate bath at pH=10 (A-C-10), nickel component consisted of fine crystals and iron was nearly amorphous. In addition, in the deposits from the ammoniacal tartrate bath at pH=9 (A-T-9), both nickel and iron were in nearly amorphous state.(2) Types of the baths were arranged in descending order of the brightness of deposits as follows:A-C-10>A-T-9>C-C-9The brightness was decreased with the increase of iron content in each deposit.(3) The micrographs of the cross-sections of deposits revealed that lamellar structure was detected with the decrease of iron content and it was changed to columnar structure when iron content was higher than 50%.(4) The hardness of deposits was lower with the increase of iron content.(5) The surface of deposits was likely to be converted into passive state with the increase of iron content.
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