Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia

S. A. Vologzhanina, Dr. Eng., Associate Prof., Professor, Dept. of Materials Science and Technology of Art Products, e-mail: vologzhanina_SA@pers.spmi.ru
R. M. Khuznakhmetov, Postgraduate Student, e-mail: ruslan.rh44@gmail.com

A. V. Mikhaylov, Cand. Eng., Assistant, Dept. of Materials Science and Technology of Art Products, e-mail: Mikhaylov_AV2@pers.spmi.ru

Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg, Russia
I. V. Kurta, Cand. Eng., Associate Prof., Head of the Directorate of Continuing Education and Industry Partnershieps, e-mail: kurta_iv@spbstu.ru
M. A. Kovalev, Research Engineer, e-mail: kovalev_ma@spbstu.ru

This article presents the results of tests evaluating the corrosion resistance of convex laser markings obtained by forming a relief pattern through melt control in the laser-impacted zone in the surface layer of 12Kh18N10T austenitic steel used to manufacture LNG logistics equipment (tanks and cylinders, tankers, road and rail tankers, pipelines, and pipeline fittings). The relevance of this work is due to the operation of these products in challenging atmospheric conditions typical of coastal zones and industrial regions, where exposure to chloride aerosols, condensates, and the acidic environment of marshy and peaty soils is possible. Tests were conducted on specimens with a relief pattern in the central portion and control specimens without laser processing. The relief was formed using a TurboMarker automated system with a fiber laser (λ = 1064 nm, τ = 100 ns, Pnom = 100 W) using specified scanning modes. Corrosion tests were conducted in a salt spray chamber under various conditions. Surface condition was assessed visually, gravimetrically, and by optical metallography. Electrochemical studies were also conducted, comparing the characteristics of the base metal and laser-treated area for corrosion potential, pitting potential, and pitting resistance. After testing, no corrosion or pitting products were detected on the samples, nor was any significant weight loss observed. The surface texture remained legible, which is important for traceability during maintenance and repair. Electrochemical data showed no signs of intense degradation of the passive state under the test conditions. The results confirm the feasibility of using convex laser marking as a durable identification method for LNG equipment components, resistant to external aggressive influences.
The authors express their gratitude to the staff of Peter the Great St. Petersburg Polytechnic University for their assistance in conducting this research.

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