定電流及脈衝法之鋅–鎳合金電鍍

Electrodeposition of Zn-Ni Alloy by Constant-Current and Pulse Plating

本研究採用定電流及脈衝法（脈衝電流及脈衝反向電流）進行鋼鐵的鋅－鎳合金電鍍，以比較評估所得鍍層之組成及其物理性質。就鍍層組成而言：脈衝法鍍層中含鎳量比定電流法高，尤以脈衝反向電流鍍法最高，此鎳含量亦隨電鍍之電流密度增加而上升。就鍍層性質而言：脈衝法之鍍層形態較細緻，並具特定之結晶優選方向。鍍層之微硬度以脈衝反向電流法最佳，脈衝電流法其次，定電流法最差。然而鍍層之耐蝕性則以脈衝電流法最佳，脈衝反向電流法最差。

Zn-Ni alloy was electrodeposited on steel by constant-current, pulse and pulse reverse methods. The composition and physical property of the deposit depended upon the techniques and current density employed. The deposit obtained via pulse reverse and pulse methods contained more concentrated Ni, in contrast to that by constant-current electrolysis, as the average current density was fixed. In each method, the Ni content in the deposit increased with increasing electrolysis current. The microhardness of the deposit was primarily determined by its Ni content; however, the corrosion resistance was governed not only by its Ni content but also by its microstructure.