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캐비테이션에 의한 베어링재의 부식 침식거동에 관한 연구〔 1 〕( pH 의 영향에 대하여 )
임우조,이진열 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.4
Recently, due to increased occurance of cavitation-erosion at slide bearing metals with the tendency of high speed and large output at internal combustion engine, there is a need to study the role of corrosive environments on cavitation-erosion. Therefore, This paper were investigated on the behaviour of cavitation-erosion under the change of pH environments at slide bearing metals with using piezoelectric vibratory appratus. The main results obtained were as follows: 1. The weight loss and its rate showed to be increased according to the order of pH 2 > pH 12 >pH 7 >pH 4 environments, and also retarded extremely at pH 4 environment 2. The resistance of material on cavitation-erosion was excellent at pH 4 environment, and also was improved considerably its resistance with increasings of the space between specimen and horn tip. 3. It was showed that the incubation periods shortened with the tendency of pH 2 > pH 12 > pH 4 > pH 7 environment, and enlarged greatly at pH 7 environment. 4. The pitted holes of damaged surface under pH 4 environment showed dense aspects by comparison with pH 7 environment.
임우조,정해규,심경태 한국안전학회 2004 한국안전학회지 Vol.19 No.2
Al-brass is the raw material of manufacturing tubes for heat exchanger of vessel where seawater is used to coolant because it has high level of heat conductivity and excellent mechanical properties and high level of corrosion resistance due to cuprous oxide(Cu₂O) layer against seawater. However, damage of Al-brass tubes for heat exchanger of vessel is reported that local corrosion such as stress corrosion cracking occurred by synergism effect between mechanical factor and corrosion environment. In this study, to investigate on the effect of stress on the polarization characteristics of Al-brass. At the stress of 0% and 95% yield strength by constant displacement tester, in 3.5% NaCl + 0.1% NH₄OH solution, the polarization tests were carried out. And thus open circuit potential, corrosion current density, anodic polarization, cyclic polarization and dezincification behavior of Al-brass are investigated.