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Investigation on pitting corrosion rate of Micro Plasma Arc Welded Titanium (Ti-6Al-4V) alloy sheets in KBr solution using TOPSIS



Titanium is having good anti-corrosion properties in both basic and acidic medium. However, when it is subjected to severer heating processing like welding, there is a possibility of corrosion formation at the weld joint. In the present work Pulsed current MPAW is used for joining 0.5 mm thick Titanium (Ti-6Al-4V) alloy sheets. Peak Current, Base Current, Pulse Rate and Pulse Width are considered as input parameters and fusion zone corrosion rate is considered as output response. Four factors and five levels are considered. Taguchi L25 orthogonal matrix is adopted and 25 experiments are performed. Linear Polarization method is adopted and corrosion rates are measured from Tafel plots for three different mediums namely 0.5N KBr, 1.5N KBr, 1.5N KBr and 2N KBr. Empirical mathematical models are developed using statistical software (MINITAB). Analysis of Variance (ANOVA) is carried out at 95% confidence level. Effects of welding parameters on corrosion rate are studied. Multi objective optimization of corrosion rate for the three mediums was carried out using TOPSIS (Technique for Order Preference by Similarly to Ideal Solution).



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ASM International, ASM Handbook Properties and Selection: Nonferrous Alloys and Special – PurposeMaterials, vol. 2, 1992.

E. Almanza, M.J. Pérez, N.A. Rodríguez, L.E. Murr, Corrosion resistance of Ti-6Al-4V and ASTM F75 alloys processed by electron beam melting, Journal of Material Research & Technology,6(3), 2017,pp.251–257.

Yanping Zhu, Changyi Li and Lianyun Zhang, Effects of Cryo-Treatment on Corrosion Behavior and Mechanical Properties of Laser-Welded Commercial Pure Titanium, Materials Transactions, Vol. 55, No. 3,2014, pp. 511- 516.

Robert P. Houser , Performance of Eleven Ti Alloys in High Temperature, High Pressure Brine Solution, Proceedings World Geothermal Congress 2010 Bali, Indonesia, 25-29 April 2010,pp.1-5.

C.G. Nava-Dino, C. Lopez-Melendez, R. G. Bautista-Margulis, M. A. Neri-Flores, J.G. Chacon-Nava, S.D de la Torre, J.G. Gonzalez-Rodriguez and A. Martinez-Villafane, Corrosion Behavior of Ti-6Al-4V Alloys, Int. J. Electrochem. Sci., 7,2012,pp. 2389 – 2402.

Saeid Yazdani, Mahmoud Hajisafari, Arman Zare Bidaki, Fatigue and Corrosion Fatigue Properties of Ti-6Al-4V Implant Grade Titanium Alloy in Ringer Solution, Journal of Advanced Materials and Processing, Vol. 5, No. 3, 2017, pp.12-22.

Kondapalli Siva Prasad, Ch.Srinivasa Rao, D.Nageswara Rao, Effect of welding parameters on pitting corrosion rate in 3.5N Nacl of Pulsed Current Micro Plasma Arc Welded AISI 304L sheets, Journal of Manufacturing science and production, Volume.13,Issue-1-2,2013, pp.15-23.

Kondapalli Siva Prasad, Ch.Srinivasa Rao, D.Nageswara Rao, Optimization of pulsed current parameters to minimize pitting corrosion in Pulsed Current Micro Plasma Arc Welded AISI 304L sheets using Genetic Algorithm, International Journal of Lean Thinking, Voulme.4,Number.1,2013, pp.9-19.

Neusa Alonso-Falleiros, Stephan Wolynec, Correlation between Corrosion Potential and Pitting Potential for AISI 304L Austenitic Stainless Steel in 3.5% NaCl Aqueous Solution, Materials Resaerch, 5(1),2002, pp 77-84.

B Tsaneva, L Fachikov, Y Marcheva, M Lukajcheva, B. Kostadinov, Corrosion of Chromium Manganese-Nitrogen Steels In Chloride Media, Journal of the University of Chemical Technology and Metallurgy, 42(2),2007,pp 163-168.

P. Fauvet , Balbaud R, Robin Q, T Tran, A Mugnier , D Espinoux, Corrosion mechanisms of austenitic stainless steels in nitric media used in reprocessing plants, Journal of Nuclear Materials, 375,2008, pp.52–64.

C.L. Hwang, K. Yoon, Multiple Attribute Decision Making. Springer-Verlag, Berlin, 1981.

M. Behzadian, S. KhanmohammadiOtaghsara, M. Yazdani, J. Ignatius, A state-of the-art survey of TOPSIS applications, Expert Systems with Applications, 39, 2012,pp. 13051-13069.

M.F. Chen, G.H. Tzeng, Combining grey relation and TOPSIS concepts for selecting an expatriate host country, Mathematical and Computer Modeling, 40, 04, pp.1473-1490.


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