Development of Corrosion resistant Ag-Pd-Cu-Au alloys for patient with metal hypersensitivity

开发用于金属过敏患者的耐腐蚀Ag-Pd-Cu-Au合金

• 批准号: 11671943
• 负责人: ENDO Kazuhiko
• 金额: $ 2.5万
• 依托单位: Health Sciences University of Hokkaido
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11671943/
• 关键词: Ag-Pd-Cu-Au alloy; Corrosion resistance; Passivity; metal hypersensitivity; Castability; Vickers hardness; 腐食; 硫化変色; 動電位分極法; X線光電子分光法; 交流インピーダンス法; 原子吸光法

The corrosion behaviors of eighteen Ag-Pd-Cu-Au alloys with different compositions were examined in 0.9 % NaCl and 0.1 % Na_2S solutions to develop a high corrosion resistant and biocompatible (allergy free) dental casting alloy. The effects of small amount of Ga on the castability, mechanical strength, and corrosion resistance of the Ag-Pd-Cu-Au alloy were also examined. The corrosion resistance was evaluated by electrochemical techniques and the analysis of released metal ions by atomic absorption spectrophotometry. The surface of the alloy was analyzed by X-ray photoelectron spectroscopy (IPS). The corrosion resistance of the Ag-Pd-Cu-Au alloy both in 0.9 % NaCl and 0. 1% Na2S solutions increased with an increase in Pd content. It was found that the Pd-25Ag-18Cu-12Au alloy with 45 mass% Pd was passive in 0.1 % Na_2S solution with the formation of Pd-rich sulfide film and did not tarnish unlike commercial Ag-Pd-Cu-Au alloys which tarnished with the formation of crystalline corrosion product of Ag_2S. The amount of released metal ions from the Pd-25Ag-18Cu-12Au alloy in 0.9 % NaCl solution was approximately 10 % of that from the commercial Ag-Pd-Cu-Au alloys. The addition of small amount of Ga (less than 5 mass%) lowed the liquids point of the Pd-25Ag-18Cu-12Au alloy and improved its castability without decreasing the resistance to corrosion and tarnish. The small amount of Ga also increased the value of Vickers hardness number. These results suggested that high level of resistance to corrosion and tarnish and excellent biocompatibility of the Pd-25Ag-18Cu-12Au alloy make this alloy suitable as a material for dental casting restoration.

为研制一种高耐蚀性、生物相容性（无过敏）的牙科铸造合金，研究了18种不同成分的Ag-Pd-Cu-Au合金在0.9%NaCl和0.1%Na_2S溶液中的腐蚀行为。研究了微量Ga对Ag-Pd-Cu-Au合金铸造性能、机械强度和耐蚀性的影响。通过电化学技术和原子吸收分光光度法分析释放的金属离子来评估耐腐蚀性。通过X射线光电子能谱（IPS）分析合金的表面。研究了Ag-Pd-Cu-Au合金在0.9%NaCl和0。1%Na_2S溶液中Pd含量的增加，溶液中Pd含量增加，溶液中Pd含量增加。结果表明，Pd含量为45%（质量分数）的Pd-25 Ag-18 Cu-12 Au合金在0.1%Na_2S溶液中形成富Pd的硫化物膜而钝化，不像商用Ag-Pd-Cu-Au合金那样因Ag_2S结晶腐蚀产物的形成而变色。Pd-25 Ag-18 Cu-12 Au合金在0.9%NaCl溶液中的金属离子释放量约为商业Ag-Pd-Cu-Au合金的10%。添加少量Ga（质量分数小于5%）可降低Pd-25 Ag-18 Cu-12 Au合金的液点，改善合金的铸造性能，而不降低合金的耐蚀性和变色性。少量的Ga也增加了维氏硬度值。结果表明，Pd-25 Ag-18 Cu-12 Au合金具有良好的耐蚀性、抗变色性和生物相容性，适合作为铸造修复材料。

项目成果

K. Endo, H. Ohno et al.: "Effects of Ga addition on the corrosion resistance of Pd-25Ag-18Cu-12Au alloy"J. J. Dent Mater. 18, Special 34. 141 (1999)

K. Endo，H. Ohno等：“Ga添加对Pd-25Ag-18Cu-12Au合金耐蚀性的影响”J。

遠藤一彦: "金属の腐食から見た金銀パラジウム合金"歯科材料・器械. 18巻. 83 (1999)

Kazuhiko Endo：“从金属腐蚀角度看金银钯合金”《牙科材料和仪器》第 18 卷（1999 年）。

K. Endo: "Corrosion Characteristics of dental casting Ag-Pd-Cu-Au alloys"J. J. Dent. Mater.. 18 Special 33. 83 (1999)

K. Endo：“牙科铸造Ag-Pd-Cu-Au合金的腐蚀特性”J。

遠藤一彦: "金属の腐食から見た金銀パラジウム合金"歯科材料・器械. 18巻・特33. 83 (1999)

Kazuhiko Endo：“从金属腐蚀角度看金银钯合金”《牙科材料和仪器》第 18 卷，特刊 33. 83 (1999)。

M.Iijima, K.Endo, et al.: "Corrosion Behavior and Surface Structure of Orthodontic Ni-Ti Alloy Wires"Dental Materials Journal. 20. 103-113 (2001)

M.Iijima、K.Endo 等人：“正畸镍钛合金丝的腐蚀行为和表面结构”牙科材料杂志。