Electrochemical corrosion behavior at high temperature solution treatment of dental casting Au-Ag-Pd alloys

SUGIMURA Toyohiko, FUKUI Hisao, KURODA Kensuke, SATO Ayano, AKAHORI Toshikazu

doi:10.18939/jsdmd.32.6_469

Bibliographic Information

Other Title

歯科鋳造用金銀パラジウム合金の高温溶体化処理と電気化学的腐食特性
シカチュウゾウヨウキンギンパラジウムゴウキンノコウオンヨウタイカショリトデンキカガクテキフショクトクセイ

Search this article

Abstract

To study the microstructures and their relationship to corrosion characteristics, seven alloys for dental castings with varying ratios of copper/silver content were each subjected to high temperature solution treatment of 1023 K and 1123 K for one hour. The corrosion examination was carried out in an environment of 3% NaCl using the anodal polarization method. Based on this study, the following results were obtained: 1. In the microstructure of the gold-silver- palladium alloy castings which varied in the quantity of their copper/silver ratios, the solutions in both heat treatments consisted of 3 phases: α₁ phase, α₂ phase, and β phase. 2. The corrosion resistance of alloys improved at 1023 K and 1123 K due to the decrease of Cu content in the a, phase and the decrease of Ag content in the α₂ phase. 3. The electric potential of the three phases in the microstructure was lowest in the α₁ phase, but increased in phases α₂and β in that order. 4. Corrosion resistance improved when the gold in the alloy reached 20 mass % in comparison with an alloy of 12 mass% gold content. This is because the gold solution greatly increases in the α₁ phase.

Journal

THE JOURNAL OF JAPANESE SOCIETY FOR DENTAL MATERIALS AND DEVICES

THE JOURNAL OF JAPANESE SOCIETY FOR DENTAL MATERIALS AND DEVICES 32 (6), 469-478, 2013

The Japanese Society for Dental Materials and Devices

Keywords

Details 詳細情報について

Export