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The inhibition action of N-furfuryl-N'-phenyl thiourea on the corrosion of mild steel in acid media
S. DIVAKARA SHETTY,PRAKASH SHETTY,H. V. SUDHAKER NAYAK
Journal of the Serbian Chemical Society , 2006,
Abstract: The inhibiting effect of N-furfuryl-N'-phenyl thiourea (FPTU) on the corrosion of mild steel in aqueous solutions of 0.05 and 0.1MHCl, as well as 0.025 and 0.05 M H2SO4 has been demonstrated using the potentiodynamic polarization technique. The polarization data showed that FPTU acts as an efficient anodic inhibitor for mild steel in both acid solutions. Avery high inhibition efficiency was evidenced in both acid solutions and it was found to vary with the concentration of the inhibitor and temperature. The obtained kinetic parameters of adsorption revealed spontaneous adsorption and a strong interaction of FPTU with the mild steel surface.
Nucleation and growth microstructural study of ti films on 304 SS substrates
Vieira, Rogério de Almeida;Nono, Maria do Carmo de Andrade;
Materials Research , 2004, DOI: 10.1590/S1516-14392004000300017
Abstract: coating of steel surfaces with titanium films has been studied with the objective to protect them against corrosion, and to create an intermediate film for cvd diamond and tin film deposition. in this work, the nucleation, growth mechanisms and microstructural formation of the titanium films deposited on 304 stainless steel (304 ss) substrate are presented and discussed. the titanium films of variable thickness were obtained by vapour phase deposition produced by electron beam. the surfaces of these samples were observed by scanning electron microscopy. the cross sections of these samples were observed by using an atomic force microscope. the ti film-304 ss interfaces were analyzed by x-ray diffraction. the results showed that titanium films have a columnar growth. the ti film-304 ss interface had a residual compression stress at room temperature due to the inter-diffusion process.
Nucleation and growth microstructural study of ti films on 304 SS substrates
Vieira Rogério de Almeida,Nono Maria do Carmo de Andrade
Materials Research , 2004,
Abstract: Coating of steel surfaces with titanium films has been studied with the objective to protect them against corrosion, and to create an intermediate film for CVD diamond and TiN film deposition. In this work, the nucleation, growth mechanisms and microstructural formation of the titanium films deposited on 304 stainless steel (304 SS) substrate are presented and discussed. The titanium films of variable thickness were obtained by vapour phase deposition produced by electron beam. The surfaces of these samples were observed by scanning electron microscopy. The cross sections of these samples were observed by using an atomic force microscope. The Ti film-304 SS interfaces were analyzed by X-ray diffraction. The results showed that titanium films have a columnar growth. The Ti film-304 SS interface had a residual compression stress at room temperature due to the inter-diffusion process.
Corrosion Behavior of Mild Steel and SS 304L in Presence of Dissolved Copper  [PDF]
M. Mobin, Hina Shabnam
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.912081
Abstract: The failure of steel components in multistage flash (MSF) desalination or power plants as a result of the deposition of carryover heavy metals/oxides is a common problem and reported by many authors. The present investigation was undertaken to study the corrosion behavior of mild steel and AISI 304L SS in presence of dissolved Cu ions under different experimental conditions. The experimental conditions include: variation in aqueous medium, Cu ion concentration, pH and flow condition. The corrosion rate of mild steel and SS 304L in presence of different concentration of Cu was determined by weight loss measurements and solvent analysis of iron ions into the test solution after completion of immersion. The amount of Cu ions present in the test solution after completion of immersion was also estimated using Atomic absorption spectrophotometer. The pH of the test solution was monitored during the entire period of immersion. Electrochemical techniques like free corrosion potential measurements and potentiodynamic polarization measurements were carried to find out the role of Cu ions on the corrosion behavior of mild steel and SS 304L. The effect of Cu on corrosion rate of mild steel is quite pronounced and follows interesting trend. However, SS 304L is not affected either in distilled water or artificial seawater and do not show any significant variation in corrosion rates in presence of Cu ions.
A novel method of evaluating low curve for SS304 from low cost indentation experiments  [PDF]
A. Kumaraswamy,B. Sridhar Babu,V. Vasudeva Rao
Journal of Engineering and Applied Sciences , 2010,
Abstract: Static indentation and compression tests have been conducted at a common strain rate of 10-3s-1 on SS304 heated to 1273 K held there for 30 min and subsequently cooled in the atmosphere. In the present work an attempt was made in evaluating the Constraint Factor (CF) i.e., the ratio of Meyer Hardness to flow stress as a function of average strain perusing the Meyer hardness data points and flow stress data points at constant strain over a considerable strain range. An attempt was also made in converting Meyer hardness Vs average strain curve to a flow curve in uniaxial tensile/compression test by applying CF obtained from the literature. It has been observed that, Meyer hardness Vs average strain curve is matching with flow curve at a CF value of 3.06 for SS304. In addition to this, an effort is made in evaluating the important properties like strain hardening exponent and strength coefficient for SS304 from static indentation and compression tests.
EXPERIMENTAL INVESTIGATIONS OF WELD CHARACTERISTICS FOR A SINGLE PASS TIG WELDING WITH SS304
S. P. GADEWAR,,PERAVALI SWAMINADHAN,M. G. HARKARE,,S. H. GAWANDE
International Journal of Engineering Science and Technology , 2010,
Abstract: This paper tries to investigate the effect of process parameters like weld current, gas flow and work piece thickness on the Bead Geometry (Front width and Back width) of the welded joint. The working range of the experimentation is decided by test experiments. For joining the work piece by TIG welding for 304 stainless steel (SS304), the process parameters play an important role. During experimentation it is found that, increase in the welding current result in increase in heat input. This increased heat is utilized to melt the base metal.Similarly as thickness of the work piece increases rate of gas flow need to be increased to increase the heat diffusion rate. Increase in gas flow avoids the vaporization of the molten metal. It also increases the penetration. The increase in weld current and gas flow results in change in Bead Geometry of the welded joint which dominates the weld characteristics. The variations in the process parameters affect the mechanical properties with great extent.
SS304不锈钢循环变形行为温度效应的实验研究  [PDF]
康国政,高庆,蔡力勋,杨显杰
材料工程 , 2003,
Abstract: 对SS304不锈钢进行了系统的室温、高温单轴和非比例多轴应变控制循环和应力控制循环行为的实验研究。重点讨论了温度变化对材料应变循环特性和棘轮行为的影响;同时也讨论了在同一温度、不同加载形式条件下材料的应变循环特性和循环棘轮行为特征。结果表明,SS304不锈钢的循环变形行为具有明显的温度效应,并且在400~600℃范围内,材料会体现出显著的动态应变时效特性。
304SS/NaCl体系中环己胺的缓蚀作用  [PDF]
刘剑平,宋诗哲,唐子龙
化工学报 , 1999,
Abstract: 采用稳态阳极极化曲线、电化学阻抗谱(EIS)、恒电位开路衰减响应曲线和计时电位法等多种电化学测试技术研究了环己胺对AISI304不锈钢在NaCl溶液中的孔蚀缓蚀性能。结果表明环己胺不仅可以显著降低304不锈钢在NaCl体系中的孔蚀敏感性,而且对蚀孔发展也有较好的抑制效果。缓蚀作用是由于环己胺在金属表面形成吸附层,提高了钝化膜的自修复能力,从而抑制了蚀孔的发生和发展。
Deformation of SS 304 LN during Scratch Test and Influence on Evolution of Coefficient of Friction  [PDF]
Satender Kataria,Niranjan Kumar,Sitaram Dash,Ashok Kumar Tyagi
Advances in Tribology , 2009, DOI: 10.1155/2009/648075
Abstract: An AISI 304 LN nuclear grade forged, metallographically polished specimen was subjected to progressive load scratch tests using a spheroconical indenter at three different scratch speeds 1, 3, and 27 mm/min. The present study attempts to address the evolution of coefficient of friction with scratch speed invoking its correlation with scratch induced deformation in the specimen. At higher scratch speeds, plastic deformation rates were higher which caused friction coefficient to be of higher magnitude. This was correlated with dynamically obtained high resolution optical images that revealed deformation driven microstructural alterations. These alterations significantly influenced the evolution of friction coefficient which was intimately related to plasticity of the surface.
Experimental study on Pulsed and Non-Pulsed Current TIG Welding of Stainless Steel sheet(SS304)  [PDF]
A.RAVEENDRA,DR.B.V.R.RAVI KUMAR
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: In this experimental work tests were conducted on the weldments of SS304using GTAW with pulsed current and non-pulsed current at different frequencies of 5Hz,&10Hz on 3mm thick sheets. Hardness test, tensile test and microstructure results of weldments were studied . The aim of this experimental work is to see the effect of pulsed current on the characteristics of weldments. The experimental results pertaining to different welding parameters for the above material using pulsed and non-pulsed current GTAW are discussed and compared.
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