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Corrosion behavior of mild steel and SS 304L in presence of dissolved nickel under aerated and deaerated conditions
Mobin, Mohd;Shabnam, Hina;
Materials Research , 2011, DOI: 10.1590/S1516-14392011005000076
Abstract: in dual purpose water/power co-generation plants, the presence of high concentration of cu and ni in the re-circulating brine/condensate as a result of condenser tubes corrosion has been attributed as one of the several causes of corrosion damage of flash chamber materials and water touched parts of the boilers. the present investigation deals with the effect of dissolved nickel in the concentration range of 10 ppb to 100 ppm on the corrosion behavior of mild steel and ss 304l in two aqueous medium namely, distilled water and artificial seawater. the effect of ph, dissolved oxygen and flow condition of aqueous medium on the corrosion behavior was also monitored. the experimental techniques include immersion test and electrochemical tests which include free corrosion potential measurements and potentiodynamic polarization measurements. the corrosion rate of mild steel and ss 304l under different experimental conditions was determined by weight loss method and spectrophotometric determination of iron ion entered into the test solution during the period of immersion. the ph of the test solution was also monitored during the entire period of immersion. the left over nickel ions present in the test solution after completion of immersion was also estimated using atomic absorption spectrophotometer. the surface morphology of the corroded steel surface was also examined using scanning electron microscopy (sem). the results of the studies show that ss 304l largely remains unaffected in both distilled water and artificial seawater under different experimental conditions. however, the effect of nickel on the corrosion behavior of mild steel is quite pronounced and follows interesting trends.
Comparison of Aggressiveness Behavior of Chloride and Iodide Solutions on 304 and 304L Stainless Steel Alloys  [PDF]
Shaymaa Mahdi Salih, Ibtehal K. Shakir, Abdulkareem M. A. Al-Sammarraie
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.812065
Abstract: The aggressive effect of chloride anion in comparison to iodide anion on the pitting corrosion attack of 304 and 304L stainless steel (SS) alloys was investigated by using the cyclic potentiodynamic polarization test at 0.6 M Sodium Halide salts (NaX) solution and different temperatures. The two alloys 304 and 304L SS suffered from severe pitting corrosion at room temperature up to 50°C in a chloride containing solution with the higher resistance observed for 304L in comparison to the 304 while on pits were detected in iodide solution for both alloys. The pitting potentials of the two alloys in 0.6 M NaCl solution reduced with the increase of the temperature. Examination of the alloys’ surfaces was conducted by using the scanning electron microscopes where it revealed that the occurrence of pitting attack seems like hemispherical or irregular pits with different sizes.
THE CRITICAL POTENTIAL FOR INTERGRANULAR CORROSION OF 304 STAINLESS STEEL
304L不锈钢晶间腐蚀的临界电位

FANG Zhi,WU Yinshun,LI Jiuqing,SUN Dongbai,
方智
,吴荫顺,孙冬柏,李久青,江光,崔在明

腐蚀科学与防护技术 , 1995,
Abstract: There are two potential ranges for 304L stainless steel sensitive to intergranular corrosion in 0.5mol / LH2SO4+10(-3)mol/L CH3CSNH2 solution. One is active-passive transitive potential range, the critical potential for the other is 1040mV(SCE). The material is sensitive to intergranular corrosion at potentials above this value. The susceptibility to intergranular corrosion of 304L stainless steel can be judged by potentic-static method. The bigger the current density andthe slope of current density-time curves at a certain potential, the more susceptive to intergranularcorrosion.
Atmospheric corrosion of mild steel  [cached]
Morcillo, M.,de la Fuente, D.,Díaz, I.,Cano, H.
Revista de Metalurgia , 2011,
Abstract: The atmospheric corrosion of mild steel is an extensive topic that has been studied by many authors in different regions throughout the world. This compilation paper incorporates relevant publications on the subject, in particular about the nature of atmospheric corrosion products, mechanisms of atmospheric corrosion and kinetics of the atmospheric corrosion process, paying special attention to two matters upon which relatively less information has been published: a) the morphology of steel corrosion products and corrosion product layers; and b) long-term atmospheric corrosion ( > 10 years). La corrosión atmosférica del acero suave es un tema de gran amplitud que ha sido tratado por muchos autores en numerosas regiones del mundo. Este artículo de compilación incorpora publicaciones relevantes sobre esta temática, en particular sobre la naturaleza de los productos de corrosión atmosférica, mecanismos y cinética de los procesos de corrosión atmosférica, prestando una atención especial a dos aspectos sobre los que la información publicada ha sido menos abundante: a) morfología de los productos de corrosión del acero y capas de productos de corrosión, y b) corrosión atmosférica a larga duración (> 10 a os).
STRESS CORROSION CRACKING OF 304L STAINLESS STEEL IN WATER AT 288℃
LU Yonghao,CHU Wuyang,GAO Kewei,QIAO Lijie,
陆永浩
,褚武扬,高克玮,乔利杰,T.Shoji

金属学报 , 2004,
Abstract: 敏化的304L不锈钢紧凑拉伸试样在288℃的含氧循环水中发生应力腐蚀(SCC)后,沿试样横截面将裂纹尖端区制成透射电镜(TEM)试样,用高分辨分析型TEM观察裂尖,测量微区成分.结果表明,在不连续的SCC裂纹周围及裂尖前方存在几百纳米宽的氧化物区,成分为Cr2O3,Fe3O4或其混合物.在氧化物中存在大量的纳米级浅裂纹,在裂尖应力集中作用下,氧化物中首先形成不连续的微裂纹,它们长大并和主裂纹连接就导致SCC裂纹的不连续形核及扩展.
Corrosion Evaluation of SS-304 Stainless Steel for the Application to Heat Pumps
Arteaga,C. Cuevas; Chavarín,J. Uruchurtu; Martínez G.,Miguel A.;
Portugaliae Electrochimica Acta , 2005,
Abstract: studies of the corrosion evaluation of ss-304 stainless steel exposed in aqueous lithium bromide solution have been carried out applying the electrochemical noise technique, polarization curves and the weight loss method. the test temperatures were 50, 60 and 70 °c, and the exposure time was for fifteen days. the main objective was to determine the corrosion rates and the type of corrosion that ss-304 suffers under the mentioned conditions with the purpose of evaluating its application to heat pumps/transformers. the results showed that at the three test temperatures the type of corrosion was a mixed and pitting process. at 60 °c, it was observed some anodic peaks at the fifth day of exposure, indicating pitting nucleation. from 7 to 12 days a regular and continue pitting process was observed, and then the corrosion process became in generalized type. at 70 °c, some isolated and medium intensity peaks were observed, presenting behaviour of some mixed and pitting corrosion. the resistance noise was calculated through a statistical analysis, and then the stern-geary equation and faraday law were applied to determine the mass loss, which was compared to that obtained from weight loss method. tafel slopes were determined from experimental polarization curves. to support the metallic oxidation carried out on the stainless steel surface, atomic absorption analysis was made to the solution corrosion products.
Corrosion Evaluation of SS-304 Stainless Steel for the Application to Heat Pumps  [cached]
C. Cuevas Arteaga,J. Uruchurtu Chavarín,Miguel A. Martínez G.
Portugaliae Electrochimica Acta , 2005,
Abstract: Studies of the corrosion evaluation of SS-304 stainless steel exposed in aqueous lithium bromide solution have been carried out applying the electrochemical noise technique, polarization curves and the weight loss method. The test temperatures were 50, 60 and 70 °C, and the exposure time was for fifteen days. The main objective was to determine the corrosion rates and the type of corrosion that SS-304 suffers under the mentioned conditions with the purpose of evaluating its application to heat pumps/transformers. The results showed that at the three test temperatures the type of corrosion was a mixed and pitting process. At 60 °C, it was observed some anodic peaks at the fifth day of exposure, indicating pitting nucleation. From 7 to 12 days a regular and continue pitting process was observed, and then the corrosion process became in generalized type. At 70 °C, some isolated and medium intensity peaks were observed, presenting behaviour of some mixed and pitting corrosion. The resistance noise was calculated through a statistical analysis, and then the Stern-Geary equation and Faraday Law were applied to determine the mass loss, which was compared to that obtained from weight loss method. Tafel slopes were determined from experimental polarization curves. To support the metallic oxidation carried out on the stainless steel surface, atomic absorption analysis was made to the solution corrosion products.
Correlation between Corrosion Potential and Pitting Potential for AISI 304L Austenitic Stainless Steel in 3.5% NaCl Aqueous Solution
Alonso-Falleiros, Neusa;Wolynec, Stephan;
Materials Research , 2002, DOI: 10.1590/S1516-14392002000100013
Abstract: we investigated the effect of surface finish of two aisi 304l (uns s30403) stainless steels on the corrosion potential (ecorr) in 3.5% nacl aqueous solution and its value was compared with the pitting potential (ep) value and the type of anodic potentiodynamic curve obtained for determination of ep in this solution. five different surface finishes were examined. ecorr and its standard deviation are strongly affected by the type of surface finish. moreover, there are evidences of a linear correlation between ecorr and ep, as well as between the percentage of anodic curves with a well-defined pitting potential and the uncertainty in the determination of ecorr.
Correlation between Corrosion Potential and Pitting Potential for AISI 304L Austenitic Stainless Steel in 3.5% NaCl Aqueous Solution
Alonso-Falleiros Neusa,Wolynec Stephan
Materials Research , 2002,
Abstract: We investigated the effect of surface finish of two AISI 304L (UNS S30403) stainless steels on the corrosion potential (Ecorr) in 3.5% NaCl aqueous solution and its value was compared with the pitting potential (Ep) value and the type of anodic potentiodynamic curve obtained for determination of Ep in this solution. Five different surface finishes were examined. Ecorr and its standard deviation are strongly affected by the type of surface finish. Moreover, there are evidences of a linear correlation between Ecorr and Ep, as well as between the percentage of anodic curves with a well-defined pitting potential and the uncertainty in the determination of Ecorr.
SEMICONDUCTIVE PROPERTIES OF PASSIVE FILM FORMED ON 304L STAINLESS STEEL
304L不锈钢钝化膜半导体性能研究

LI Jin-bo,ZHENG Mao-sheng,ZHU Jie-wu,
李金波
,郑茂盛,朱杰武

腐蚀科学与防护技术 , 2006,
Abstract: The semiconductive properties of passive film formed on 304L stainless steel in 0.5 mol/L NaHCO_3 solution were detected using polarization curve,capacitance measurement and X-ray photoelectron spectroscopy(XPS) measurements.In addition,the factors which affect the semi-conductive characteristic of the passive film was also discussed.The results show that the passive film exhibits p-type semiconductive characters in the potential region lower than -0.4 V,and n-type semiconductive chracters in the potential region of-0.4V to 0.26 V.With the measured frequency decreasing and film formation potential moving to much negative,the slopes of M-S plots decreases,this indicates that the impurity density in the film increases.The addition of chlorine ion in the solution can decrease the slopes of the M-S plots,and enhance the occurrence of pitting corrosion on the 304L SS.The XPS result ravels an inner layer of Cr oxide and an outer layer of Fe oxide,which is in agreement with the previous works.
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