CAJ | 학술논문

滨海电厂常以天然海水作冷却水,其碳钢水室和钛管凝汽器在实施阴极保护过程中,要求钢电位应低于-0.85V(vs. SCE),电位过正则碳钢保护不足,而钛的电位则须高于-0.75V(vs. SCE),电位过负则易使钛管发生氢脆损伤.研究牺牲阳极阴极保护,需先得出两种金属在阴极保护过程中的电位分布.本文在设计室建立碳钢水室钛管模型,根据该实验体系阴极保护过程的的(稳态极化和恒电流极化)测定获得两种金属有效的边界条件,用有限元(FEM)计算在一个牺牲阳极阴极保护状态得到三维电位分布.计算结果和测量结果基本一致,为优化阴极保护设计提供了理论依据.
빈해전엄상이천연해수작냉각수,기탄강수실화태관응기기재실시음겁보호과정중,요구강전위응저우-0.85V(vs. SCE),전위과정칙탄강보호불족,이태적전위칙수고우-0.75V(vs. SCE),전위과부칙역사태관발생경취손상.연구희생양겁음겁보호,수선득출량충금속재음겁보호과정중적전위분포.본문재설계실건립탄강수실태관모형,근거해실험체계음겁보호과정적적(은태겁화화항전류겁화)측정획득량충금속유효적변계조건,용유한원(FEM)계산재일개희생양겁음겁보호상태득도삼유전위분포.계산결과화측량결과기본일치,위우화음겁보호설계제공료이론의거.
When condensers with carbon steel waterbox and titanium tube structure were protected by SACP in an ocean beach power plant, while seawater were used to be cooling water, carbon steel was under-protected and Titanium was over-protected,because their protective potential are less than -0.85V(vs. SCE) and more than -0.75V(vs. SCE) separately. In order to optimize the SACP design,potential distribution of two materials must be obtained during the SACP process. In the lab, carbon steel waterbox and Titanium tube model (Q235-Ti model) were set up. A series of electrochemical techniques(steady polarization, galvanostatic charge technique)were used to obtain reasonable boundary condition and surface form of two materials during the SACP process. The experiments were carried out to validate 3-D potential distribution under one anode SACP condition by finite element method (FEM). The calculation results were consistent with measuring results. The results can be used to provide a theoretical foundation to design an optimal cathodic protection.