シアン化亜鉛浴における陰極分極現象に及ぼす添加剤の影響

「金属電着における添加剤の作用」(第2報)

抄録

Changes in cathode polarization, produced by the addition of organic and inorganic substances to the cyanide zinc bath have been investigated.
The addition agents studied fall into four classes according to the effect they produce:
i) Compounds which have no apparent effect on the cathode polarization. Inorganic salts of Se, Ag, Hg and Cd. Organic compounds, such as butyne diol (1, 4), propargyl alcohol, saccahrin and anthranillic acid.
ii) Those which increased the hydrogen overvoltage as well as the cathode polarization of zinc. Benzaldehyde, vanillin, heliotropine, coumarine, methylvinyl ketone, gelatin, peptone, polyvinyl alcohol and turkey-red oil.
iii) Inorganic sulfur compounds, such as Na₂S and Na₂S₂O3 produced the bright deposits even though they had no remarkable effect on the cathode polarization.
iv) The use of organic compounds, such as vanillin, heliotropine, or polyvinyl alcohol in conjunction with the metallic salt of Ni, Co, Mo or W had the pronounced effect on the cathode polarization accompanied by the bright deposits.