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Steel structure analysis by voltammetry method

DOI 10.18127/j20700784–201811–07


D.I. Davletchin - Ph.D. (Eng.), Associate Professor, Leading Engineer, Moscow State University for Information Technology, Radiotechnics, Electronics
O.A. Tonysheva - Ph.D. (Eng.), Head of Department, All-Russian Scientific Research Institute of Aviation Materials (Moscow)

Steels and alloys remain important construction materials together with new modern production materials. Our scientific interest lies in the augmentation of metal purity by introducing rare earth metals (REM). The micro-alloyage (as a rule, not more than 0, 05%) of steels with REM is one of the perspective methods of obtaining higher and more stable qualities of metals.
The atomic emission analyzers of foreign production are used for detecting REM; but there is an opportunity to apply voltammetric analyzers that will reduce the costs on purchasing expensive devices. PLS-2A is our elaboration which allows obtaining graphs in au-tomatic mode with high sensitivity and selectiveness. The usage of voltammetric analyzers in analytical chemistry reveals an important advantage of polarography in comparison with other electro-chemical methods of analysis: the possibility of its usage for highly precise quantitative and qualitative analysis of materials of organic and non-organic nature. Good instrumental supply and sensible price of our device let the implementation of the method for the analysis of diverse objects of the environment [9, 10]; the application in the industrial technological control.
The limit of detection by this method is as high as by more expensive devices. The detection of half-wave potentials gives us the chance to judge about the content of the analyzed solution with high selectiveness; one can analyze up to 7 elements in a go.
The object of the study is a high-strength corrosion-proof steel 17Х13Н4К6САМ3ч, developed in VIAM (app. #2015148792) containing the following REMs: lanthanum, yttrium, cerium, neodymium. The detection of REM in the steel by polarograhpic method was conducted in accordance with the state standard «Rare Earth Metals and their Oxides» 23862.35-79. According to the standard voltammetric detection of cerium dioxide in lanthanum oxides (from 5×10-5 to 1×10-3 %), yttrium, neodymium oxides (от 1×10-4 до 1×10-3 %) is recommended.
The apparatus recommended in the standard is PU-1, PO-5122. Pr Salikhjanova took an active part in the construction of polarographs PO, PPT-1, PU-1, PLS-1, PU-2. PLS -2A was the last device constructed under her supervision. PLS-2A has got several advantages over other Soviet analyzers. One important merit is the possibility to work with all types of electrodes which is represented today only in Swiss «Metrohm’ apparatus».
In the modern situation of import substitution one should pay attention to modern highly precise, non-expensive, universal devices of electrochemical analysis of native production (such as PLS-2A). These analyzers can detect many elements with high precision which can improve the quality of high-strength steels with unique features.

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