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首页> 外文期刊>ISIJ international >Effects of Electrolyte Composition and Additives on the Formation of Invar Fe–Ni Alloys with Low Thermal Expansion Electrodeposited from Sulfate Bath
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Effects of Electrolyte Composition and Additives on the Formation of Invar Fe–Ni Alloys with Low Thermal Expansion Electrodeposited from Sulfate Bath

机译：电解液组成和添加剂对硫酸浴中低热膨胀率殷钢Fe-Ni合金形成的影响

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The effects of solution composition and additives on the formation of electrodeposited invar Fe–Ni alloys with low thermal expansion were investigated. In all solutions, increasing the current density from 10?A·m~(?2) significantly decreased the Ni content in the deposits and resulted in anomalous codeposition, in which the electrochemically less noble Fe was preferentially deposited. Further increasing the current density increased the Ni content in the deposits as Fe deposition reached the diffusion limitation of the Fe~(2+) ions. Increasing the concentration of Fe~(2+) ions increased the current density required to initiate an increase in the Ni content in the deposits because of increase in the diffusion-limited current density of Fe. With the increasing concentration of malonic acid, the current density region in which Ni deposition was suppressed was extended, and the potential at which Fe deposition reached the diffusion limitation of the Fe~(2+) ions was shifted to a less noble direction. As a result, the relationship between the Ni content in the deposits and the current density shifted to a higher-current-density region with increasing malonic acid concentration. At malonic acid concentrations above 0.05?mol·dm~(?3), the current efficiency for alloy deposition was greatly reduced owing to the promotion of hydrogen evolution. The Ni content in the deposits was significantly increased with the addition of thiourea. Boric acid somewhat increased the Ni content in the deposits in the lower-current-density region. In solutions containing both boric acid and saccharin, an invar alloy of 36 mass% Ni was obtained in the wider-current-density region.
机译：研究了溶液组成和添加剂对低热膨胀率电沉积殷钢Fe-Ni合金形成的影响。在所有解决方案中，将电流密度从10？A·m〜（？2）增加会显着降低沉积物中的Ni含量，并导致异常共沉积，其中电化学沉积的贵金属Fe优先沉积。当Fe沉积达到Fe〜（2+）离子的扩散极限时，电流密度的进一步增加会增加沉积物中的Ni含量。由于Fe的扩散限制电流密度的增加，增加Fe〜（2+）离子的浓度会增加引发沉积物中Ni含量增加所需的电流密度。随着丙二酸浓度的增加，Ni沉积被抑制的电流密度区域扩大，Fe沉积达到Fe〜（2+）离子扩散极限的电势向不太贵的方向移动。结果，随着丙二酸浓度的增加，沉积物中的Ni含量与电流密度之间的关系转移到较高的电流密度区域。在丙二酸浓度高于0.05？mol·dm〜（？3）时，由于析氢的促进，电流沉积合金的效率大大降低。随着硫脲的添加，沉积物中的镍含量显着增加。硼酸在较低电流密度区域中增加了沉积物中的镍含量。在同时包含硼酸和糖精的溶液中，在较宽的电流密度区域中获得了36质量％的Ni的殷钢合金。

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