Abstract
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 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>HNO</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:math> 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 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>H</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>SO</mml:mtext><mml:mn>4</mml:mn></mml:msub><mml:mo>+</mml:mo><mml:msub><mml:mtext>H</mml:mtext><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>PO</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:math> 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.
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