Abstract
Steel electro-dissolution performance was investigated in orthophosphoric acid in the presence of N-oleyl 1.3 diaminopropane, Benzalkounuim chloride, Soduim lauryl sulphate and Di-Isononyl phthalate as a surfactant using potentiodynamic polarization measurements. The retardation performance of these surfactants was examined. The surfactant surface active parameters were estimated based on surface tension measurements. The parameters calculated comprise the critical micelle concentration (CMC), maximum surface excess (Гmax), minimum surface area (Amin) and effectiveness (πCMC). The micellization thermodynamic parameters (ΔGmic, ΔSmic) for the estimated surfactants were also computed. Results obtained from surface active properties are comparable with those gained from galvanostatic polarization measurements. Temperature influence on the steel dissolution performance was examined at 25 to 40oC range. Steel kinetic study in orthophosphoric acid- free solution and orthophosphoric acid containing surfactant was also examined. The dissolution kinetic and activated parameters were computed. Results based on microscopy measurement indicate that, addition of new four surfactants, resulting in the solution shows potential, a discrete progress in the metal texture was monitored. Improvement produced in electro-polishing bath by the investigated SAS that owing to the adsorption of such surface active agents on the anode surface.
Highlights
Electro-polishing is extensively working in manufacturing for micro finishing and deburring of dissimilar metallic constituents
Analysis of carbon steel specimen composition The composition of the steel electrodes used in electro-polishing was made in the Egyptian company for cupper, it is important as the metals present in the electrode alloy effects the rate of the process and the enhancement or inhibition rate in presence of the surfactants, the analysis of the steel specimen of the electrode in weight % is as follows: C (0.2%), S (0.04%), Mn (2.6%), P (0.039%), Si (0.36), Fe (96.761%)
The major CMC implication based on fact, at this concentration, the majority of the surfactant physical and chemical properties present an unpredicted difference.[17]The surface tension values (γ, mN/m) for the four surface active agents (SAS) under examination were schemed versus the logarithm of the SAS concentration at several temperatures as represented in Figure 2 The critical micelle concentration(CMCs), for the investigated SAS were concluded from the spot of interrupt of the two linear parts gained through the γ–logC plots
Summary
Electro-polishing is extensively working in manufacturing for micro finishing and deburring of dissimilar metallic constituents. A great quantity of electrolytic baths with diverse working circumstances and electrolyte compositions are estimated for long time [1]. Electro-polishing is the technique of electrolytic metal finishing, presently broadly used in numerous elevated functions like cardiovascular and orthopedic body implants, pharmaceutical and semiconductor installations. The technique offers an extremely clean, even and smooth resistant exterior. Approximately any metal, alloy and inter metallic compound may be electro-polished [2] .The importance of electro polishing on surface of metal process mainly is for the metals treatment and alloys to improve luminous surface finishes with very low surface roughness values, no residual surface tensions and improved steel resistance to deterioration [3]
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