Corrosion Behavior of Welded Austenitic Stainless Steel in Different Environments

S O. Aluko, D.S. Yawas, S.Y. Aku

Abstract


Corrosion behavior of welded austenitic stainless steel in 0.5 M hydrochloric acid and wet-steam corrosive media has been studied. The immersion time in the corrosive media was 30 days to simulate the effect on stainless steel structures/equipment in offshore and food processing applications. Annealing heat treatment was carried out on the samples. The gravimetric technique was used for the corrosion tests. Seawater sample has highest weight loss of 4.0 mg for the heat-treated samples and 4.5 mg for the unheat-treated samples. For the different media used, seawater sample has the highest corrosion rate of 0.64 × 10−6 mm/year for the heat treated samples and 0.72 × 10−6 mm/year for the unheat-treated samples. The post-welding heat treatment was found to increase the mechanical properties of the austenitic stainless steel especially tensile strength but it reduces the transformation and thermal stresses of the samples. These findings were corroborated by the microstructural examination of the stainless steel specimen.

 


Full Text:

PDF

References


Zhang YM, Pan C, Male AT. Welding of austenitic stainless steel using double sided arc welding process. Journal of Materials Science and Technology. 2001; 17: 1279–84p.

Fontana MG. Corrosion Engineering, 3rd Edn. McGraw Hill, Inc; 1998; 4–5, 153p.

Callister DW. Materials Science and Engineering: An Introduction, 7th Edn. John Wiley and Sons Incorporation, UK; 2007.

Loto CA, Ives MB. Corrosion resistance of super austenitic stainless steel in seawater. NSE Technical Journal. 1994; 29(1): 1–2p.

Iliyasu I. The susceptibility of austenitic stainless steel to stress corrosion cracking in some aggressive environments. Unpublished M.Sc. Thesis. Mechanical Engineering Department, ABU, Zaria.

Aruleba OG. Effect of isothermal tempering and time on stress–corrosion failure of stainless steel rods in acidic and seawater environments. Unpublished B.Sc. Thesis. Mechanical Engineering Department, UNAD, Ado-Ekiti.

Oni A. Effect of tempering temperature and time on stress-induced failure of low-carbon steel in corrosive environment. Nigeria Journal of Technical Education. 1998; 16(1): 42–9p.

Adeyemi M. Effect of Heat Treatment on the Quality of the Surface Finish of Turned Steel Rods. Journal of Engineering Research. 1998; 6(1): 27–35p.

Hosary AA, Saleh RM. Synergistic effect of halides and coal tar distillation of the corrosion of mild steel in sulphuric acid. Symposium on Corrosion Inhibitors. 1985; 373p.

Aiyelero MA. Effect of welding and heat treatment on the mechanical properties of austenitic stainless steel. Unpublished B.Sc. Thesis. Mechanical Engineering Department, ABU, Zaria. 2005.

Yawas DS. Suitability assessment of some plant extracts and fatty acid vegetable oils as corrosion inhibitors. Ph.D dissertation. 2005.

Omotade EA. Corrosion fatigue and microstructural behaviours of stainless steel rods under varied tempering temperature. Unpublished B.Sc. Thesis. Mechanical Engineering Department, UNAD, Ado-Ekiti. 2005.

Afolabi AS. Corrosion and stress corrosion behavior of low and medium carbon steel in agro-fluid media. Leonardo Electronic Journal of Practices and Technologies. 2007; 10: 55–66p. ISSN 1583–1078.

Dillion CP. Forms of Corrosion. MPE Engineers Inc. 2001.

Rajasekhar K. microstructural evolution during solidification of austenitic stainless steel weld metals: A color metallographic and electron microprobe analysis study. Mater Charact. 1997; 38(2): 53–65p.

Lakshminarayanan AK, Balasubramanian V, Shanmugam K. Effect of welding processes on tensile, impact, hardness and microstructure of joints made of aisi 409 fss base metal and 308l ass filler metals. Iron Mak Steel Mak. 75–80p.




DOI: https://doi.org/10.3759/joise.v1i3.3494

Refbacks

  • There are currently no refbacks.