CAJ | 학술논문

以再生水用于循环冷却水系统中铁细菌的生长特性和其对碳钢腐蚀的影响为研究目标，采用电化学手段研究铁细菌对碳钢腐蚀的影响，应用环境扫描电镜分析碳钢挂片腐蚀的表面形貌特征，并进行EDS能谱分析。结果表明：循环冷却水中铁细菌生长所需要的最佳碳源和氮源分别为柠檬酸铁铵和NaNO3；铁细菌生长过程中开路电位和极化电阻先正移再负移最后保持不变；由于生物膜分布不均匀，挂片表面会产生球状和层状两种元素组分存在明显差异的腐蚀结构；铁细菌的参与可明显影响碳钢挂片的元素成分含量，使金属的腐蚀加重。
이재생수용우순배냉각수계통중철세균적생장특성화기대탄강부식적영향위연구목표，채용전화학수단연구철세균대탄강부식적영향，응용배경소묘전경분석탄강괘편부식적표면형모특정，병진행EDS능보분석。결과표명：순배냉각수중철세균생장소수요적최가탄원화담원분별위저몽산철안화NaNO3；철세균생장과정중개로전위화겁화전조선정이재부이최후보지불변；유우생물막분포불균균，괘편표면회산생구상화층상량충원소조분존재명현차이적부식결구；철세균적삼여가명현영향탄강괘편적원소성분함량，사금속적부식가중。
The growth characteristics of iron-oxidizing bacteria (IOB) in reclaimed water used for recycle cooling water and its influence on the corrosion behavior of carbon steel were studied. Electrochemical methods were used to study the influence of IOB on carbon steel′s corrosion behavior. The morphology changes of carbon steel coupons sur-face were researched by observing with the environmental scanning electron microscope(ESEM) and chemical el-ement changes of those carbon steel coupons were analyzed by energy diffraction spectrum (EDS). The results showed that the optimum carbon source and nitrogen source of IOB were ferric ammonium citrate and NaNO3, re-spectively. The results of electrochemical test indicated that both of open circuit potential and polarization resis-tance increased at the beginning and then declined, and finally they remained unchanged in the presence of IOB. Due to the uneven distribution of biofilm, there were two different surface structures on coupons, which were spherical structure and sheet structure with different elemental compositions. The participation of IOB can signifi-cantly affect the elemental composition and concentration of steel coupons, and can increase the corrosion of the metal.