研究論文
三価クロム/有機添加剤/濃厚伝導性塩水溶性浴からの冷間圧延鋼板上への光沢性硬質Cr-C電気めっき
キーワード:
Electrodeposition,
Chromium-Carbon Alloy,
Additive,
Current Efficiency,
Vickers Hardness,
Surface Brightness
2022 年 73 巻 7 号 p. 365-373
詳細
2022 年 73 巻 7 号 p. 365-373
To prepare Cr-C alloy layers having high current efficiency, high Vickers hardness, and high brightness in electrodeposition on commercial cold-rolled steel plate, this study examined additives put into electrodeposition baths. From a Cr2 （SO4）3/（NH4）2SO4 aqueous bath containing oxalic acid and CrCl3/highly concentrated CaCl2/H3BO3 aqueous bath containing glycine, Cr-C alloy layers having high current efficiency, high Vickers hardness, and high brightness were formed. With the optimized bath compositions, the Cr-C alloy layers were produced with high current efficiency, high Vickers hardness, and high brightness. The highest current efficiency of 31.8% was obtained in a 0.4 mol kg－1 glycine/0.75 mol kg－1 CrCl3/4.68 mol kg－1 CaCl2/0.49 mol kg－1 H3BO3 bath. The Cr-C layers mainly comprised Cr3C2 and Cr7C3 alloys.
