Electrochemical study on hot corrosion behavior of aluminide diffusion coating deposited on inconel 713C superalloy

Subject Areas :

Esmaeil Taheri ¹ ( Najafabad Branch, Islamic Azad University )
Mehdi Verdian ² ( Najafabad Branch, Islamic Azad University )

Received: 2018-04-07 Accepted : 2019-06-18 Published : 2019-05-22

Keywords: hot Corrosion, Inconel 713C, Diffusion aluminide coatings,

Abstract :

In this study, the hot corrosion resistance of diffusion aluminide coating on Inconel 713C was investigated using electrochemical techniques. In this regard, potentiodynamic polarization tests were performed at 750 °C in two kinds of molten salts. The former contained 70% sodium sulphate and 30% sodium chloride. The latter was composed of 70% sodium sulphate, 25% sodium chloride and 5% vanadium pentoxide. The phase composition and microstructure of coatings and corrosion products were investigated using XRD and SEM-EDS techniques. The results showed that in the presence of vanadium, the protection efficiency of coatings increased and a current-independent region was observed in anodic polarization curve. Here, a compact corrosion product layer was seen. In absence of vanadium, both coated and uncoated samples exhibited similar corrosion rates. However, in comparison to vanadium-containing environment, all samples showed lower corrosion rate. In this case, the coatings exhibited active anodic behavior. The corrosion products were porous and discontinuous in vanadium free environment.

References:

 

[1]       س. س. خلیفه سلطانی، ر. ابراهیمی کهریزسنگی و ف. نعیمی، "بررسی رفتار سینتیکی اکسیداسیون ایزوترم دمای بالای پوشش های MCrAlY اعمال شده به روشHVOF "، فصلنامه فرآیند های نوین در مهندسی مواد، سال دهم، شماره سوم، صفحات 80 - 67، پاییز 1395.

 

[2]       س. ع. خسروی فرد، ا. ح. یقطین، ا. اخباری‌زاده و ع. عراقی، "بررسی خواص خوردگی سایشی و خوردگی داغ پوشش آلومینا اعمال شده بر روی پایه فولادی به روش پاشش حرارتی حاصل از سوخت اکسیژن‌دار"، فصلنامه فرآیند های نوین در مهندسی مواد، سال دهم، شماره اول، صفحات 69 - 59 ، بهار 1395.

 

[3]       م. طهری، "بهینه سازی پارامترهای پاشش حرارتی HVOF، برای بهبود مقاومت به اکسیداسیون پوشش MCrAlY توسط روش سطح پاسخ"، فصلنامه فرآیند های نوین در مهندسی مواد، سال یازدهم، شماره سوم، صفحات 85 – 73 ، پاییز 1396.

 

[4]       م. طهری، "بررسی تاثیر افزودن تقویت کننده Cr₂O₃ بر خواص مکانیکی و رفتار اکسیداسیون دمای بالای پوشش استلایت 6 تولید شده به روش پاشش پلاسمایی بر روی زیرلایه IN-738"، فصلنامه فرآیند های نوین در مهندسی مواد، سال یازدهم، شماره اول، صفحات 160–149، بهار 1396.

 

[5]     N. Eliaz & G. Shemesh , “Hot corrosion in gas turbine components”, Engineering Failure Analysis Uhlig CorrosionLaboratory, MassachusettsInstitute of Technology, Cambridge, Vol. 9, pp. 31-43, 2002.

 

[6]     G. A. El-Awadia, S. Abdel-Samada & E. S. Elshazly, “Hot corrosion behavior of Ni based Inconel 617 and Inconel 738superalloys”, Applied Surface Science, Vol. 378, pp. 224–230, 2016.

 

[7]     Q. X. Fan, S. M. Jiang, H. J. Yu & J. Gong, “Microstructure and hot corrosion behaviors of two Co modified aluminide coatings on a Ni-based superalloy at 700°C”, Applied Surface Science, Vol. 311, pp. 214–223, 2014.

 

[8]     D. Pradhan, G. Shankar Mahobia, K. Chattopadhyay & V. Singh, “Effect of pre hot corrosion on high cycle fatigue behavior of the superalloy IN718 at 600 °C”, International Journal of Fatigue, Vol. 114, pp. 120–129, 2018.

 

[9]     Thomas, M. K. Adler Flitton & S. Agarwala, “Corrosion Fundamentals, Testing, and Protection”, ASM Handbook, Vol. 13A, 2003.

 

[10] H. Haiyan, L. Zongjie & W. Wang, “Microstructure and hot corrosion behavior of Co–Si modified aluminide coating on nickel based superalloys”, Corrosion Science, Vol. 100, pp. 466-473, 2015.

 

[11] B. Ching-Yuan, L. Yi-Jun & K. Chun-Hao, “Improvement of high temperature oxidation and corrosion resistance of superalloy IN-738LC by pack cementation”, Surface and Coatings Technology, Vol. 183, pp. 74-88, 2004.

 

[12] K. Shirvani, M. Saremi, A. Nishikata & T. Tsuru, “Electrochemical study on hot corrosion of Si- modified aluminide coated In-738LC in Na2SO4-20 wt.% NaCl melt at 750 °C”, Corrosion Science, Vol. 45, pp. 1011-1021, 2003.

 

[13] M. Sarvghad, T. Steinberg & G. Will, “Corrosion of stainless steel 316 in eutectic molten salts for thermal energy Storage”, Solar Energy Materials and Solar Cells, 2017.

 

[14] M. Ferrari, O. Gutiérrez & E. Costa-Rama, “Batch injection electroanalysis with stainless-steel pins as electrodesin single and multiplexed”, Sensors and Actuators, Vol. 253, pp. 1207–1213, 2017.

 

[15] F. Shahriari & F. Ashrafizadeh, “The effect of the growth mode of the pre-diffused layers on the microstructure of aluminide coatings modified by titanium or silicon for gas turbine hot-section applicationsTransactions of Materials and Heat Treatment”, Department of Materials Engineering, Isfahan University of Technology, 28 February 2012.

 

[16] P. Marashi, S. Kaviani, H. Sarpoolaky & A. Zolfaghari, “Fundamentals Applications Of Electron Microscope and New Analyssis Methodsˮ, Iran University of Science and Technology, Third Edition, 1391.

 

[17] S. Bose, “High Temperature Coatingsˮ, Elsevier Science & Technology Books, Butterworth-Heinemann, 2007.

 

[18] J. L. Trinstancho-Reyes, M. Sanchez-Carrillo & R. Sandoval-Jabalera, “Electrochemical Impedance Spectroscopy Investigation of Alloy Inconel 718 in Molten Salts at High Temperature”, International Journal of Electrochimical science, Vol. 6, pp. 419-431, 2011.

 

[19] N. Birks, G. H. Meier & F. S. Pettit, “Introduction to the High Temperature Oxidation of Metals”, 2nd Edition, Cambridge University Press, 2006.

 

[20] M. Salehi Doolabi, B. Ghasemi, S. K. Sadrnezhaad, A. Habibollahzadeh & K. Jafarzadeh, “Hot corrosion behavior and near-surface microstructure of a “low-temperature high-activity Cr-aluminide, coating on inconel 738LC exposed to Na₂SO₄, Na₂SO₄+V₂O₅ and Na₂SO₄+V₂O₅+NaCl at 900°C”, Corrosion Science, Vol. 128, pp. 42-53, 2017.

 

[21] D. John Young, “High Temperature Oxidation and Corrosion of Metals”, Elsevier Corrosion Series, 1st Edition, 2008.

 

[22] M. K .Kianicova, J. Kafrik & J. Trnik, “Degradation of Aluminide Coatings Deposited on Nickel Superalloys”, Procedia Engineering, Vol. 136, pp. 346-352, 2016.