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galvanic effects on cavitation damage for 1Cr13 stainless steel

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Journal of University of Science and Technology Beijing 2003年第4期10卷 33-37页

作者： Dongbai Sun, Xia Bai, Hongying Yu, Huimin Meng, and Huiqing LiUNDP-Beijing Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China UNDP Corrosion Ctr. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Based on the electric-spark principle, a new kind of cavitation damagetesting apparatus was designed, which could produce the bubble. Bubbles collapsed and acted on asmall surface area of the alloy surface, so an intensive electrochemical inhomogenous state would beinduced and lead to the existence of surface galvanic effect on the alloy. The galvanic effect of1Cr13 SS during cavitation damage has been quantitatively investigated in NaCl solution. The resultsshow that intensive galvanic effect of 1Cr13 SS during cavitation damage appears the potential ofthe damaged area shifting negatively with the bubble collapse and simultaneously the galvaniccurrent generates. The mass loss of alloy due to cavitation increases with the bubble quantity, andincreases with the increasing of Cl- content. And both the total mass loss and the mass loss due togalvanic corrosion increase linearly with the area ratio of cavitation damaged to undamaged *** surface galvanic effects speed up the dissolution rate of the alloy, which, in turn,accelerates the mechanical damage, and aggravates the mass loss of the alloy. It has been furtherconfirmed that the mass loss due to the surface galvanic effect can be decreased by catholicprotection.

关键词： cavitation damage galvanic effect area ratio mass loss

QUANTITATIVE STUDY ON galvanic effectS DURING CAVITATION DAMAGE OF 1Cr13 STAINLESS STEEL

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Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 15-21页

作者： X.Bai D.B.Sun H.Y.Yu X.L.Zhang Corrosion and Protection Cent. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The influence of the surface galvanic effects of 1Cr13 SS during cavitation damage has been investigated in NaCl solutions. The results show that the solution concentration and area ratio of bubble unacted surface to the bubble-acted surface greatly influence the cavitation damage of the alloy. The surface galvanic effects can speed up the dissolution rate of the alloy, and the mass loss per area of the alloy increases linearly with the area ratio of bubble unacted surface to the bubble acted surface of the alloy.

关键词： galvanic effect cavitation damage area ratio mass loss

galvanic corrosion behavior of die cast AZ91D magnesium alloy in chloride solution

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Journal of University of Science and Technology Beijing 2004年第2期11卷 127-132页

作者： ZhensongTong WeiZhang JiuqingLi JinGao JiquanHe JiZhou CorrosionandProtectionCenter UniversityofScienceandTechnologyBeijingBeijing100083China

: The galvanic corrosion behavior of die cast AZ91D magnesium alloy coupled with H62 brass, 316L stainless steel, A3 steel and LY12 aluminum alloy of different areas in 3.5% NaCl solution was studied. The free corrosion potentials, galvanic potentials and currents of these galvanic couples were measured. The galvanic effects were determined by the mass loss and regression method using three points. The results show that: (1) In these four kinds of couples AZ91D acts as the anode, whose galvanic corrosion behavior is mainly controlled by the cathodic polarization; (2) The free corrosion potentials of these four kinds of couples change a little with time and cathodic/anodic area ratio (CAAR); (3) The galvanic potential of AZ91D/LY12 moves positively with the increase of time and CAAR; (4) The galvanic currents increase with CAAR, but there is difference in the current change between different couples; (5) The anodic dissolution rate of the magnesium alloy increases by 2-3 orders after being coupled with these four kinds of metals and the galvanic effects of these couples have such a relation as γH62> γ316L.S.S>γLY12>γA3.

关键词： magnesium alloy galvanic corrosion galvanic effect

Corrosion behavior of 13Cr stainless steel under stress and crevice in high pressure CO_(2)/O_(2)environment

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Journal of Materials Science & Technology 2021年第29期88卷 79-89页

作者： G.Y.Zhu Y.Y.Li B.S.Hou Q.H.Zhang G.A.Zhang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Materials Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China

In this work,through the self-developed setup for in situ electrochemical tests,the corrosion behavior of 13 Cr stainless steel under the combined effect of stress and crevice in high pressure CO_(2)/O_(2)environment was *** results show that 13 Cr stainless steel presents a self-passivation *** the action of stress,the anodic dissolution process of steel inside crevice is *** is a galvanic effect between the stressed steel inside crevice and the unstressed steel outside *** applied stress reduces the induction stage of crevice corrosion and induces a larger galvanic current,i.e.,the applied stress promotes the development of crevice ***,adding 0.1 MPa O_(2)is conducive to forming a more stable passive film but causes a greater galvanic effect.

关键词： Stainless steel Crevice corrosion Stress corrosion galvanic effect

A STUDY OF ELECTROCHEMICAL BEHAVIOUR OF VARIOUS THERMAL HISTORY ZONES AND DIFFERENT PHASE STRUCTURES ON THE WELDMENT FOR LOW ALLOY STEEL 16Mn IN NITRAfE SOLUTION

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Acta Metallurgica Sinica(English Letters) 1998年第4期11卷 270-274页

作者： Y.S.Wu D.Y. Liu B. Cao F. L. Wang X.Y. Wang Z.Fang and Z.G.Du (Department of Surface Science and Corrosion Engineering, University of Science and Technology Beijing,Beijing 100083, China)

The electrochemical behaviour, including free corrosion potential, free corrosion current density and polarization curve, of various thermal history zones on the weldment was measured in this paper. The weldment consisted of matrix, tempering zone. incomplete normalized zone, normalized zone, overtemperature zone, fusion line zone and weld metal zone. The electrochemical behaviour of the ferrite, pearlite and mixed structure in various zones have successfully measured. The results showed that there was a difference of free corrosion potential which is smaller than ca. 200mV between various zones and about 20-150mV potential difference between ferrite and pearlite in every zone. The free cormsion potential of fusion line zone was the most negative between various zones. The free corrosion potential of pearlite was some dozens mV more negative than ferrite. The corrosion course of various zones and of different phase structures on the weldment and their effect on corrosion attack of weldment were discussed.

关键词： weldment phase electrochemistry galvanic effect thermal history zone