Electrolytic Aluminizing of Low Carbon Steel as Protection Treatment for Current Leads against High Temperature Oxidation

Vadim Anatolyevich Kovrov; Vladimir Tsvetov; Yuriy Zaikov; Albert Rafaelyevich Mullabaev; Pavel Aleksandrovich Pyankov

doi:10.4028/www.scientific.net/MSF.844.141

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HomeMaterials Science ForumMaterials Science Forum Vol. 844Electrolytic Aluminizing of Low Carbon Steel as...

Electrolytic Aluminizing of Low Carbon Steel as Protection Treatment for Current Leads against High Temperature Oxidation

Abstract:

Application of protective aluminum-based coatings is one of the ways to increase the oxidation resistance of low-carbon steel. The electrolytic deposition of aluminum in the NaF₃₃-KF_15.2-(AlF₃)_51.8 wt.% melt at 920°C and the current density of 0.8-1.0 A·cm^-2 (0.25 A·h·cm^-2) have provided a continuous aluminide coating based on Fe₂Al₅ with a good adhesion to the steel substrate due to dissolution of oxide film from the surface of the treated products in fluoride melt. The resistance of steel samples to sulfide corrosion was investigated in a lab-scale three-electrode cell at 900°C in contact with a “Soderberg” carbon anode, which was obtained by carbonization of the coal tar pitch containing 2.0-2.5 wt.% of sulphur. The IR_C (ohmic voltage drop in contact layer) growth rate was 3.3 times higher for uncoated steel due to formation of the oxide-sulfide layer based on FeS. The electrolytically aluminized steel with preliminarily formed α-Al₂O₃ layer possessed more stable value of the IR_C in comparison with the uncoated steel because of the higher chemical resistance.

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Periodical:

Materials Science Forum (Volume 844)

Pages:

141-145

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.844.141

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Online since:

March 2016

Authors:

Vadim Anatolyevich Kovrov*, Vladimir Tsvetov, Yuriy Zaikov, Albert Rafaelyevich Mullabaev, Pavel Aleksandrovich Pyankov

Keywords:

Electrolytic Aluminizing, High Temperature Oxidation, Low Carbon Steel, Sulfide Corrosion

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