EFFECTIVENESS EVALUATION OF THE CONVERSION COATINGS APPLICATION ON TITANIUM ALLOYS IN CONTACT WITH GFRP UNDER NOMINALLY STATIONARY CONTACT CONDITIONS

Authors

DOI:

https://doi.org/10.18372/0370-2197.2(111).21334

Keywords:

titanium alloys, coating, wear resistance, fretting, fiberglass, analysis, testing, nominally fixed contact

Abstract

Titanium products are very often used conversion coatings that are formed on the metal surface as a result of a chemical reaction with reagents or the environment. The purpose of using such coatings is to increase corrosion protection, ensure better adhesion with paint coatings, decorative aspect, and also increase wear-resistant characteristics. The paper analyzes the use of conversion coatings on titanium alloys for wear protection. Tests have shown that conversion coatings increase the wear resistance of titanium alloy Ti5Al5V5Мо1Cr1Fe for anodic coating by 10% and by 6% for phosphate coating in combination with GFRP. The shallow depth of the coating up to 20 μm and insufficient hardness only provide protection from reinforcing glass fibers of the composite material for a while and then only enhance the damage effect. When E-glass fibers come into contact with conversion coatings, deep grooves are formed at the micro level, which are located in the sliding direction. Due to shearing and setting, the products of conversion coatings, titanium oxides and glass fiber particles are mixed on the friction surface into a tribological layer that mainly has an abrasive effect. As a result of fretting processes, microcracks and areas of titanium coating delamination are formed on the surface near the grain boundaries, which increase the destruction of the titanium surface. Anodizing provides greater protection due to the formation of a film that is 40 % harder than phosphating.

Author Biographies

Andrii Khimko, National University KAI

Candidate of Technical Sciences, Associate Professor, Associate Professor of Air Transport Department, National University KAI, 1 Lubomyra Huzar Ave., Kyiv, Ukraine

Margarita Khimko, National University KAI, First Deputy Director of LLC Airline "H3OPERATIONS"

Candidate of Technical Sciences, Associate Professor of Air Transport Department, National University KAI, First Deputy Director of LLC Airline "H3OPERATIONS", 6b Staronovodnytska St., Kyiv, Ukraine, 01015

Ruslan Makarenko, National University KAI

Candidate of Technical Sciences, Associate Professor of the Department of Aviation Engineering, National University KAI, 1 Lyubomyr Huzar Ave., Kyiv, Ukraine, 03058

Vitalii Tokaruk, National University KAI

Candidate of Technical Sciences, Associate Professor, Air Transport Department, National University KAI, 1 Lubomyr Huzar Ave., Kyiv, Ukraine, 03058

References

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Published

2026-05-31

How to Cite

Khimko, A., Khimko, M., Makarenko, R., & Tokaruk, V. (2026). EFFECTIVENESS EVALUATION OF THE CONVERSION COATINGS APPLICATION ON TITANIUM ALLOYS IN CONTACT WITH GFRP UNDER NOMINALLY STATIONARY CONTACT CONDITIONS. Problems of Friction and Wear, (2(111), 31–39. https://doi.org/10.18372/0370-2197.2(111).21334

Issue

No. 2(111) (2026)

Section

Проблеми тертя та зношування

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