Electrochemical Fabrication and Characterization of Corrosion-Resistant, Ternary, Lead-Based Alloys as a New Material fo
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IT is known that with all the electrochemical processes, including the corrosion processes, which obey the laws of the electrochemical kinetics, their rates occur and increase on the boundary of two adjacent phases on the surface of a substrate. It is also known that iron and ordinary steels are alloying with carbon, thermodynamically unstable, and always subjecting to an intensive corrosion. In traditional methods, to increase the corrosion resistance of carbon steel alloys in many electrolytes, depending on their purpose, they should be bulky doped by introducing them into a bath solution of electroplating that contains a composition of expensive metals such as chromium, nickel, molybdenum, zirconium, etc. (steel additive metals).[1] On the one hand, this led to an increase in the cost of steel, and on the other hand, such a method does not always improve the structural properties of the materials against the corrosion so well. In the last 30 years, to increase the corrosion resistance of steel, intensive work on the coated steel with a corrosion-resistant thin layer of thickness 10 to 50 lm was done; this layer reliably protects the steel from corrosion in various aggressive environments.[2,3] The surface coating using alloying can be achieved by using various methods; one of them is an electrochemical A.SH. ALIYEV, Senior Researcher and Head of the Laboratory of Electrochemistry, H.M.TAHIRLI, Senior Researcher at the Laboratory of Electrochemistry, N.SH. SOLTANOVA, Researcher at the Laboratory of Electrochemistry, and D.B. TAGIEV, Head, are with the Institute of Catalysis and Inorganic Chemistry, National Academy of Sciences of Azerbaijan, AZ 1143 Baku, Azerbaijan. MAHMOUD ELROUBY, Lecturer, is with the Chemistry Department, Faculty of Science, Sohag University, Shag 82524 Egypt. Contact e-mail: [email protected] Manuscript submitted October 15, 2015. Article published online March 30, 2016. 2072—VOLUME 47B, JUNE 2016
method. The advantages of the electrochemical method can be summarized as follows: easily varying the electrolysis conditions including temperature, stirring concentration, pH of the solution, and the rate of coating process. For that, the thickness of the protective layer can be successfully managed as well as its simplicity and the low-cost performance. Recently,[4] the kinetics and the mechanism of the electrochemical synthesis of the ternary Pb-Sb-Te alloy in boron hydrofluoric acid electrolytes on different metal substrates were studied, along with studying its semiconducting properties. The authors discovered unique corrosion resistance of the alloy in sulfate–sulfide solutions. In previous work, the phase and the chemical composition of the resultant coating alloy and the percentage distribution of the components across the surface were not studied. In this work, the corrosion resistance of the coated steel with Pb-Sb-Te alloy was examined only by using the gravimetric method (weight loss); the electrochemical method was not used. But, on the other hand, more focused study o
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