Testing of intergranular and pitting corrosion in sensitized welded joints of austenitic stainless steel

Bore V. Jegdic, Biljana Bobić, Milica Bošnjakov, Behar Alić

Abstract


Pitting corrosion resistance and intergranular corrosion of the austenitic stainless steel X5Cr Ni18-10 were tested on the base metal, heat affected zone and weld metal. Testing of pitting corrosion was performed by the potentiodynamic polarization method, while testing of intergranular corrosion was performed by the method of electrochemical potentiokinetic reactivation with double loop. The base metal was completely resistant to intergranular corrosion, while the heat affected zone showed a slight susceptibility to intergranular corrosion. Indicators of pitting corrosion resistance for the weld metal and the base metal were very similar, but their values are significantly higher than the values for the heat affected zone. This was caused by reduction of the chromium concentration in the grain boundary areas in the heat affected zone, even though the carbon content in the examined stainless steel is low (0.04 wt. % C).


Keywords


stainless steels; welded joints; pitting corrosion; intergranular corrosion; electrochemical test methods

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References


M. A. Streicher (Revised by J.F. Grubb), Austenitic and Ferritic Stainless Steels, in Uhlig’s Corrosion Handbook, third ed., Ed. by R.W. Revie 2011, 657-693.

K.H. Lo, C.H. Shek, J.K.L. Lai: Mater Sci Eng R 65 (2009) 39–104.

K. Kaneko, T. Fukunaga, K. Yamada, N. Nakada, M. Kikuchi, Z. Saghi, J.S. Barnard and P.A. Midgley: Scripta Mater 65 (2011) 509-512.

A.A. Seys, M.J. Brabers and A.A. Van Haute: Corrosion 30 (1974) 47-52.

T. Suzuki, M. Yamabe and Y. Kitamura: Corrosion 29 (1973) 18-22.

J. Soltis: Corros Sci 90 (2015) 5-22.

G.S. Frankel: J Electrochem Soc 145 (6) (1998) 2186-2198.

J.R. Galvele: J Electrochem Soc 123 (4) (1976) 464-474.

J.R. Davis, editor, Corrosion of Weldments, ASM International, Materials Park, Ohio, 2006., p. 5.

H. Yanliang, B. Kinsella, T. Becker: Mater Lett 62 (2008) 1863–1866.

Welding Consumables -Wire Electrodes, Wires and Rods for Arc Welding of Stainless and Heat-resisting Steels – Classification - EN 12072.

Electrochemical potentiokinetic reactivation measurement using the double loop method (based on Čihal´s method) - ISO 12732.

D.L. Engelberg, Intergranular Corrosion, in Shreir’s Corrosion, Fourth ed., Academic Press, London, 2011, 810-827.

Micrographic determination of the apparent grain size-ISO 643.

Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys - ASTM G61.

Method of measuring the pitting potential for stainless steels by potentiodynamic control in sodium chloride solution – ISO 15158.

Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements to Determine the Corrosion Susceptibility of Small Implant Devices - ASTM F2129.

Yuming Tang, Yu Zuo, Jiani Wang, Xuhui Zhao, Ben Niu, Bing Lin: Corros Sci 80 (2014) 111–119.

Mary P. Ryan, David E. Williams, Richard J. Chater, Bernie M. Hutton & David S. McPhail:Nature, 415 (2002) 770-774.


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Metall Mater Eng   ISSN: 2217-8961

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