Corrosion resistance of gold-platinum ceramic alloys after repeated casting

doi:10.3969/j.issn.2095-4344.1569

Abstract

Abstract:

BACKGROUND: Our previous findings indicate that the chemical composition and mechanical properties of gold-platinum (Au-Pt) ceramic alloy have no changes after repeated casting.

OBJECTIVE: To investigate the influences of repeated casting on the corrosion resistance of Au-Pt ceramic alloy.

METHODS: The Au-Pt ceramic alloy (primary alloy) was taken to carry out the first casting, and the generation I alloy (the scrap alloy such as the base and the casting channel) was obtained under the molten casting environment which was vacuum-added argon gas. The first-generation alloy was treated before recasting, in order to obtain the generation II alloy (base, cast iron and other scrap alloys), and then to obtain the generation III alloy (base, cast steel and other scrap alloys). The alloys at I-III generations were immersed in the electrolyte (pH=2.35) for 7 days. The type and concentration of metal ions in the leaching liquor were determined to calculate the corrosion rate of the immersed alloys using the weight loss method. The surface topography of the immersed alloys was observed, and in addition, the surface roughness and surface free energy of each specimen were tested.

RESULTS AND CONCLUSION: (1) After the immersion of Au-Pt ceramic alloys at different generations, only three kinds of elements including indium, tin, iron were detected. The amount of indium deposited was the highest among the three kinds of elements, but there was no difference in the amount of metal ions deposited at each generation and the total amount of metal ions deposited at I-III generations among the various alloys (P > 0.05). (3) There was no difference in the corrosion rate between the generation III alloys (P > 0.05). (3) Under the scanning electron microscope, the surface of the alloys at I-III generations showed uniform scratches before immersion, and obvious corrosion marks were observed after immersion. (4) After immersion, the surface roughness of the alloys at I-III generations was increased, and the surface roughness of the generation II and III alloys showed no difference from that of the generation I alloys (P > 0.05). (5) After immersion, the surface free energy of the alloys at I-III generations was increased, but there was no difference between different generations of the alloys (P > 0.05). Overall, the corrosion resistance of Au-Pt ceramic alloy has no significant change after casting 1-3 times.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Metal Ceramic Alloys, Corrosion, Tissue Engineering

CLC Number:

R459.9

R318.08

Chen Xi, Shi Qiaorui, Zheng Ming, Cheng Hui. Corrosion resistance of gold-platinum ceramic alloys after repeated casting[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(6): 838-842.

Figures/Tables 6

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