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首页> 外文期刊>Protection of Metals >Chrome Plating from Sulfate - Oxalate Cr(III) Baths. Structure, Composition, and Corrosion Behavior
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Chrome Plating from Sulfate - Oxalate Cr(III) Baths. Structure, Composition, and Corrosion Behavior

机译：从硫酸盐-草酸盐Cr（III）浴中镀铬。结构，成分和腐蚀行为

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摘要

The studies on chrome-plating from sulfate-oxalate Cr(III) baths are generalized. It is shown that the metal is deposited from the mentioned baths at a current efficiency over 40 percent and forms deposits of any thickness. Chrome-plating may be carried out in the cells with undivided cathodic and anodic compartments, which reduces the current efficiency to 25-30 percent. The reflectivity and color of the deposits do not differ from those of the deposits from standard chrome-plating baths based on Cr(VI). Special attention is paid to the studies of the corrosion and electrochemical behavior of deposited layers. Steady-state polarization curves in a 0.5 M H_2SO_4 indicate that the studied chromium deposits exhibit no active-dissolution range. The free corrosion-potential is shifted in the positive direction compared with coatings deposited from standard chrome-plating baths and falls into the passivity range. According to XPS method, the passive film is about several nanometers thick and, along with oxide compounds of chromium, includes its carbides formed during the electroplating.
机译：综述了硫酸盐草酸盐Cr（III）镀液镀铬的研究。结果表明，金属以超过40％的电流效率从上述熔池中沉积，并形成了任何厚度的沉积物。镀铬可以在带有未分隔的阴极和阳极隔室的电池中进行，这会将电流效率降低到25％至30％。沉积物的反射率和颜色与基于Cr（VI）的标准镀铬浴的沉积物的反射率和颜色没有区别。特别注意沉积层的腐蚀和电化学行为的研究。 0.5 M H_2SO_4中的稳态极化曲线表明，所研究的铬沉积物未显示出活性溶解范围。与从标准镀铬浴中沉积的涂层相比，自由腐蚀电位向正方向移动，并落入钝化范围内。根据XPS方法，钝化膜约为几纳米厚，并且与铬的氧化物一起包括其在电镀过程中形成的碳化物。

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