The Corrosion Process of Brass and its Inhibition in Acidic Solutions
Chemical Product Design and Engineering (CPD&E)
Chemical Product Design & Engineering - Poster (CPD&E - P)
Keywords: brass, corrosion, polarization, inhibitor
The Corrosion Process of Brass and its Inhibition in Acidic Solutions
Zoran Avramovic1, Milan Antonijevic2,
1) TiR, Copper Smelter and Electrolysis Plant, D.Vajfert 20, 19210 Bor, Serbia
2)University in Belgrade, Technical Faculty Bor, VJ 12, 19210 Bor, Serbia
Abstract
The corrosion behaviour of brass has been studied from an aspect of dezincification mechanism of cold-deformed CuZn-42 brass were tested in acid sulphate solution at pH-value 2 with additional chloride ions and corrosion inhibitors with potentiostatic polarization method. Thiourea (TU), benzotriazole (BTA), ethylene diamine tetraacetic acid (EDTA), hydrazine sulphate (HS) and 2-butin-1,4 diole (DS-3) have been used as effective acid corrosion inhibitors. Increase of a concentration of the Cl- ions, exept for value of 5•10-2moldm-3, resulted in a significant increase of value for corrosion current densities. In solution without inhibitors, process of dezincification and anode dissolution of CuZn-42 brass was developed in the whole range of tested potentials, and pointed out the unstability of formed on their surface. The results of studies show that only thiourea, in concentration of 10-2%, inhibit the corrosion of brass in chloride solutions. Inhibitor benzotriazole in concentration of 10-1% inhibit the corrosion of brass with inhibition efficiency more then 94%. The film improved significantly the protecting ability of brass surface to corrosion in chloride solutions. When the films were modified with benzotriazole the quality and corrosion protection of films improved rapidly.
Presented Wednesday 19, 13:30 to 15:00, in session Chemical Product Design & Engineering - Poster (CPD&E - P).
