Fe-Ni alloy coatings were electrodeposited on ferritic stainless steel(FSS)in solutions containing FeSO4 and NiSO4.The effects of pH,[Fe2 +]/[Ni 2+](molar ratio)of electroplating solutions and cathode current density on deposition rate and surface appearances of the coatings were investigated.The results indicated that the deposition rate of the coating in solution with [Fe 2+ ]/[Ni 2+ ]of 0.4 slightly increased with increasing pH from 2.5 to 3.5 under the current density of 5.5 mA/cm 2 ,and then the deposition rate of the coating in solution with pH 4.0 began to decrease.The deposition rate also slightly increased with pH up to 3.5 under higher cathode current densities of 13.5 and 27 mA/cm2.Under 13.5 mA/cm 2,however,the coating deposited in solution with pH 4 was prone to crack or flake.The deposition rate increased and the surface of coatings became less smooth with increasing cathode current density.The effect of the ratio of[Fe2 +]to[Ni 2+]on deposition rate was not obvious.With increasing the ratio of [Fe2 +]to[Ni 2+]in plating solution,the content of Fe in the coatings increased;while the Ni content in the coatings decreased with the increase in the ratio of[Fe 2+ ]to[Ni 2+ ].The deposited coating consisted of Fe-Ni alloy phase.
展开▼
机译：在含FeSO4和NiSO4的溶液中，将Fe-Ni合金涂层电沉积在铁素体不锈钢（FSS）上。pH，[Fe2 +] / [Ni 2 +]（摩尔比）和电镀液的阴极电流密度对沉积速率的影响结果表明，在电流密度为5.5的条件下，当pH从2.5提高到3.5时，[Fe 2+] / [Ni 2+]为0.4的溶液中的涂层沉积速率略有增加。 mA / cm 2，然后在pH 4.0的溶液中涂层的沉积速率开始降低。在较高的阴极电流密度（13.5和27 mA / cm2）下，随着pH升高到3.5，沉积速率也略有增加。在13.5 mA / cm2以下但是，随着阴极电流密度的增加，在pH 2的溶液中沉积的涂层容易发生裂纹或剥落。沉积速率增加，涂层表面的光滑度降低。[Fe2 +]对[ Ni 2+]对沉积速率的影响不明显。随着镀液中[Fe2 +]与[Ni 2+]的比例的增加，涂层中Fe的含量增加;而随着[Fe 2+]与[Ni的比例]的增加，涂层中的Ni含量降低。 2+]。沉积的涂层由Fe-Ni合金相组成。
展开▼
