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EFFECT OF DEPOSITION TEMPERATURE ON CORROSION RESISTANCE OF NANO-CEC

Rustem Atchibayev

Abstract

An electrolyte for chromium based nano-composite electrolytic coatings (nano-CE?) obtaining has been developed. Nano-CEC was applied on steel of the St 3 brand with constant exposure to ultrasound, electrolyte temperature 50?60°?, current density 7kA/m2 for 1 and 2 hours from two variants of chromium-plating electrolytes, differing in the fact that one electrolyte contained strontium sulfate, in the other ? without it. Quantitative assessment of the corrosion resistance of nano - CEC deposited on steel St.3, was estimated by the gravimetric method with an accuracy of 0.1 mg by comparison with the anticorrosion resistance of St.3 steel without coating. For corrosion testing of samples with nano-CEC, we developed and created a stand that allows you to simultaneously test 8 samples in a stream of corrosive medium pumped by a peristaltic pump with a speed in the range of 10-60 rpm. Distilled water and a solution of sodium chloride in concentrations of 5, 10, 20% were used as an aggressive medium. The tests were carried out at a flow rate of corrosive medium 40 rpm and temperatures of 19-23, 30, and 40 ° C. A test bench for corrosion resistance has been developed and created, which allows: to carry out tests in various corrosive environments at temperatures from room temperature to 60-70 ° C; to carry out tests at different modes of exposure of the corrosive medium to the test parts using a peristaltic pump, which allows changing the flow rate from zero to 60 rpm; simultaneously test 8 samples, which increases the reliability of the results.

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