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Microstructure and Electrochemical Corrosion Behavior of Fe-Cr System Alloys as Substitutes for Ni-Based Brazing Filler Metal

引用

Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 697-706页

作者： kangdao shi takahiro tsunoda ikuo shohji kotaro matsu yasuhiro taguchi Graduate School of Engineering Gunma UniversityKiryuGunma 376-8515Japan Graduate School of Science and Technology Gunma UniversityKiryuGunma 376-8515Japan Tokyo Braze Co LtdShikiSaitarma 353-0001Japan

Two new Fe-Cr system alloys,Fe-20Cr-43Ni-10P（mass%）and Fe-20Cr-20Ni-8P-5Si-2Mo（mass%）,have been developed as substitutes for the expensive Ni-based brazing filler metal used in brazing exhaust gas recirculation *** microstructures and melting properties of the alloys were analyzed by electron probe X-ray microanalyzer and differential scanning *** electrochemical characteristics of the alloys were investigated by potentiodynamic polarization testing in an electrolyte solution made in accordance with the standards of the Automobile Manufacturers Association of ***,the corrosion behaviors of the alloys were investigated by constant-potential polarization testing and surface *** is found that both alloys are composed of solid-solution phases and phosphide *** solid-solution phases serve as the anode,and the phosphide phases serve as the cathode in the corrosion reaction for both ***-20Cr-43Ni-10 P exhibits galvanic corrosion on the entire *** contrast,Fe-20Cr-20Ni-8P-5Si-2Mo is attacked at a few localized areas so that the cavities form on the *** corrosion potential（E_（corr）） is lower than that of Ni-29Cr-6P-4Si（mass%）for both *** means that the Fe-Cr system alloys are more easily corroded than *** corrosion rate and corrosion resistance cannot be investigated by the corrosion current density（i_（corr）） and polarization resistance（R_p）,respectively,because of localized corrosion of the two alloys.

关键词： Iron-chromium system alloy Microstructure Electrochemical corrosion Brazing

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