鉄鋼の疲労強度に及ぼすNiメッキの影響(メッキ条件と疲労強度)

概要

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It is well known that the fatigue strength of machine part is generally reduced when plated with Chromium. But for nickel plating of steel there have yet been but scanty data for ensuring the effective fatigue strength. The author has investigated on that account the effect of nickel plating on the fatigue strength of carbon steel. The fatigue test specimens used in the present experiment were 10 mm in diameter, and were made of annealed 0.15%G steel or annealed and quenched-tempered 0.45%C steel. The nickel plating of these fatigue test specimens was carried out in the Watt's type bath, having the composition NiSO_4・7H_2O 240g/l, NiCl_2・6H_2O 45g/l, H_3BO_3・30g/l. Then the current densities were 1.0, 0.7, 0.5 A/dm^2, and the bath temperature was kept at 25℃. The results obtained can be summarized as follows. 1) The higher the fatigue limit is in unplated steel the lower the limit is in nickel plate steel is, no matter what the plating condition is. 2)The higher the plating current density is the larger the drop of the fatigue limit in nickel plated stress is. It is considered that this is closely connected with the presence of residual tensile stress in the plated layer. 3) Moreover, the drop of the fatigue limits in the nickel plated steel is influenced by the plate thickness. The increase of the plate thickness lowers the crack in the plated metal.
社団法人日本材料学会の論文
1966-04-15