• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development and Corrosion Rate and Corrosion Mechanism of Dental Ag-Pd-Cu-Au alloys.

Research Project

Project/Area Number 62570861
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Conservative dentistry
Research InstitutionHigashi-Nippon-Gakuen University

Principal Investigator

MATSUDA Koichi  School of Dentistry, Higashi-Nippon-Gakuen University, 歯学部, 教授 (20109458)

Co-Investigator(Kenkyū-buntansha) IBARAKI Yuji  School of Dentistry, Higashi-Nippon-Gakuen University, 歯学部, 助教授 (30139604)
OHNO Hiroki  School of Dentistry, Higashi-Nippon-Gakuen University, 歯学部, 教授 (70018430)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsAg-based alloy / Corrosion rate / 腐食速度 / 電位ー電流曲線 / Ag-Pd-Cu合金 / Ag-Pcl-Au合金 / 腐食挙動
Research Abstract

1. Corrosion rate (I_<corr>) is obtained using the following equation; I_<corr> = K/Rp (K:constant value). Six kinds of Ag-Pd alloys, four kinds of Ag-Pd-Cu alloys, one Ag-Cu alloy, and four kinds of commercial dental Ag-based casting alloys were used for the specimen and 0.1% H Cl ringer solution at pH=2, was used at the test solution in the study. In summary, I_<corr>, which changed in proportion to I/Rp, ranged from 2.3 x 10^<-8> at minimum and 4.4 x 10^<-5>(A/cm^2) at maximum, whereas the K values were localized between 13.5 and 25.9mV. The average K value was 20mV. Therefore, the Icorr of dental Ag-based alloys was estimated simply from the Rp substituting 20mV for K of the above equation. These findings revealed that the Coulostatic method is useful for rapid determination of the corrosion rate of dental alloys. 2. The corrosion behavior of a commercial Ag-Pd-Cu-Ag alloy in 0.9% NaCl solution was investigated by an electrochemical technique, surface analysis of X-ray photoelectron spectroscopy and reflection electron diffraction. No corrosion of the alloy examined was observed at negative potentials of -100mV or loss. In the potential region from OmV to +300mV, the alloy may be oxidized to form surface films of AgCl, AgO, Cu_2O, CuO, Cu(OH)Cl, CuO and CuCl_2 on the basis of the equilibrium potential for this system. Pd in the alloy was oxidized to form PdO_2 at +400mV and at +500mV. AgCl and Cu(OH)_2 were found on the sample surface anodized at +400mV and +500mV. The amount of AgCl was greater than that of Cu(OH)_2.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 坂田秀行: 歯科材料・器械. 7. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 坂田秀行: 歯科材料・器械. 7. 769-778 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Koichi Matsuda: Dental Materials Journal. 6. 1-8 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hideyuki SAKAI: "Meaurement of Polarization Resistance of Ag-Pd Binary Alloys by the Wave Current Linear Polarization Resistance Method the Coulostatic Method" The Journal of the Japanese Society for Dental Materials and Devices. 7. 270-278 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hideyuki SAKAI: "Evaluation of Corrosion of Dental Ag-based Alloys by Coulostatic Method" The Journal of the Japanese Society for Dental Materials and Devices. 7. 769-778 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Koichi Matsuda: "In vitro Corrosion of Ag-Pd-Cu-Au Alloy in 0.9% NaCl Solution Part 1 Surface Analysis of Corrosion Products" Dental Materials Journal. 6. 1-8 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 坂井秀行: 歯科材料・器械. 7. 270-278 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 坂井秀行: 歯科材料・器械. 7. 769-778 (1988)

    • Related Report
      1988 Annual Research Report

URL: 

Published: 1987-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi