ニッケル-リン合金めっき膜の内部ひずみに及ぼす亜鉛イオンの影響 [in Japanese] Effects Zinc Ions on Internal Strain in Electroplated Nickel-Phosphorus Alloy Films [in Japanese]
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Average internal strain was measured <i>in situ</i> for thin nickel-phosphorus alloy deposits electroplated from nickel-phosphorus baths containing 0.2 to 10mM ZnSO<sub>4</sub> as impurity additives using a resistance wire strain gauge placed on the reverse side of the copper substrate.<br>With increasing ZnSO<sub>4</sub> concentration, total zinc oxide and zinc hydroxide included in deposits increased monotonously and average internal tensile strain in deposits also rose. Internal tensile stress rose markedly at 1mM ZnSO<sub>4</sub>, causing numerous cracks on the surface of deposits at 1.5 to 10mM ZnSO<sub>4</sub>. At phosphorus content exceeding 12mol%, the development of average internal tensile strain in deposits was independent of phosphorus content, but clearly related to increasing total zinc oxide and zinc hydroxide included in deposits during electroplating.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 50(4), 347-352, 1999-04-01
The Surface Finishing Society of Japan