SRX Engineering

SRX Engineering / 2010 / Article

Research Article | Open Access

Volume 2010 |Article ID 261423 |

V. Alar, B. Runje, Ž. Alar, "Waste Water Treatment after Removal of Thermic Oxides from Stainless Steel Welding Joints", SRX Engineering, vol. 2010, Article ID 261423, 5 pages, 2010.

Waste Water Treatment after Removal of Thermic Oxides from Stainless Steel Welding Joints

Received25 Aug 2009
Revised29 Sep 2009
Accepted13 Oct 2009
Published23 Dec 2009


This work describes chemical methods of removal of thermic oxides from stainless steel welding joints, as well as waste water treatment. Thermal oxides were removed from the stainless steel surface using chemical and electrochemical procedures. A pickling paste that contains HNO3 and HF in different ratios was used for chemical cleansing of thermal oxides (A, B, and C). Electrochemical removal was done using an apparatus Magic Cleaner, and as electrolyte a solution H2SO4+H3PO4 was used. Concentrations of chromium, nickel, and iron in the waste water have been determined using Method of Atomic Absorption Spectrophotometrics (AAS). Measured concentrations of Cr, Ni, and Fe are higher than allowed according to legal regulations of the Republic of Croatia. Therefore, an ionic exchange treatment of the waste water is recommended.


  1. Rulebook on Marginal Values of Indicators of Dangerous and Other Materia in Waste Waters 2001, Republic of Croatia, 2001.
  2. I. Juraga and J. Raić, “Some experiences with chemical procedures for prevention of pitting corrosion on stainless steel equipment on ships,” in Proceedings of The International Conference on Materials in Oceanic Environment (EUROMAT '98), pp. 49–53, Lisbon, Portugal, July 1998. View at: Google Scholar
  3. I. Esih, I. Juraga, and S. Kralj, “Pitting tendency of welded stainless steel in chloride solutions,” in Proceedings of the European Federation of Corrosion (EUROCORR '98), pp. 9–170, Utrecht, The Netherlands, September 1998. View at: Google Scholar
  4. I. Esih, I. Juraga, and R. Bürgler, “Pitting Liability Testing of Welded Stainless steel Specimens in Various Positions and Surface States,” in Proceedings of the European Federation of Corrosion (EUROCORR '99), pp. 7–10, Aachen, Germany, September 1999. View at: Google Scholar
  5. Y. Kubo, T. Iwao, K. Takeda, and T. Inaba, “Removal characteristics of the oxide layer on the stainless steel surface by vacuum arc. influence on inside of circular hole,” Transactions of the Institute of Electrical Engineers of Japan A, vol. 122, pp. 65–71, 2002. View at: Google Scholar
  6. Y. Kameo, M. Nakashima, and T. Hirabayashi, “Removal of metal-oxide layers formed on stainless and carbon steel surfaces by excimer laser irradiation in various atmospheres,” Nuclear Technology, vol. 137, no. 2, pp. 139–146, 2002. View at: Google Scholar
  7. A. H. Tuthill and R. E. Avery, “Specifying stainless steel surface treatments,” Advanced Materials & Processes, vol. 142, pp. 34–38, 1992. View at: Google Scholar
  8. Cleaning and Descaling Stainless Steel Parts, Equipment and Systems (ASTM A 380-94), American Society for Testing Materials, West Conshohocken, Pa, USA, 1994.
  9. J. G. Dean, F. L. Bosqui, and K. H. Lanouette, “Removing heavy metals from waste water,” Environmental Science and Technology, vol. 6, no. 6, pp. 518–522, 1972. View at: Google Scholar
  10. R. Kiefer and W. H. Holl, “Sorption of heavy metals onto selective ion-exchange resins with aminophosphonate functional groups,” Industrial and Engineering Chemistry Research, vol. 40, no. 21, pp. 4570–4576, 2001. View at: Google Scholar
  11. S. D. Alexandratos, “Ion-exchange resins: a retrospective from industrial and engineering chemistry research,” Industrial and Engineering Chemistry Research, vol. 48, no. 1, pp. 388–398, 2009. View at: Publisher Site | Google Scholar

Copyright © 2010 V. Alar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

More related articles

 PDF Download Citation Citation
 Download other formatsMore
 Order printed copiesOrder

Related articles