Effect of Sulfur Compound on Trivalent Chromium Electrodeposition Behavior
Date Issued
2010
Date
2010
Author(s)
Chien, Chih-Wei
Abstract
The electrodeposition process of trivalent chromium is one of the promising replacements of hexavalent chromium electrodeposition. In this study, some organic or inorganic sulfides have been added to the trivalent chromium solution to study how the sulfides in the solution affect the microstructure and properties of the deposits, as characterized by SEM, XRD, TEM, EDS, XPS, respectively. Furthermore, owing to analyzing the sulfide influences to corrosion resistance and reduction mechanism of trivalent chromium system, polarization curve and EIS measurement were further applied.
The experimental results reveal that the sulfide addition changes the morphology and co-deposits S in the deposits. Furthermore, the C co-deposition from the complexant is inhibited; therefore, the crystallinity of deposits changes apparently. Owing to the transformation from amorphous to crystalline, the internal stress and cracks of the deposits decrease. Therefore, the corrosion resistance is highly improved. By controlling the concentration of sulfide in the solution, the composition, crystallinity, internal stress, and corrosion resistance of the deposits can be modified.
Subjects
Trivalent Chromium Electrodeposition
Sulfide
Crystallinity
Type
thesis
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