Conducting corrosion resistant nickel coating for contacts of the system of aircraft underwater locator beacons

Abstract

The paper deals with the development of manufacturing methods of improving the functionality and reliability of the electric contact made of titanic VT3-1 alloy. This alloy is used in the development of electrical contacts for acoustic beacons used on airplanes of various airline companies. Solving the problem of increasing the life of acoustic beacons (up to 90 days) is directly related to an increase in the stability of the electrochemical characteristics of the contact. To ensure the stable behavior of the electric potential (not more than 0.5 V) at the contact, a method of gas-dynamic spraying of a protective coating based on nickel of increased thickness is proposed. Single-layer and two-layer coatings obtained from different grades of powder mixtures were tested. The regularities of the process of electrochemical breakdown and passivation of protective coatings during comparative short-term tests were studied. Based on the test results, a single-layer gas-dynamic coating of the composition (Ni + Al2O3) formed from the powder mixture of grade N3-00-02 was chosen. The microstructure, phase composition, microhardness, porosity and adhesive strength of Ni-based protective coating were investigated. Electrochemical tests of electrical contact with the investigated coating in the sea water environment depending on the time factor were carried out. Increased thickness of the coatings combined with low open porosity and high adhesive strength provided stable behavior of the electric potential in the process of applying it to the working surface of the titanium alloy contacts VT3-1. This ensures reliable electrochemical protection of contacts in the sea water environment for 90 days.

About the authors

L. A. Krivina

Institute of Applied Physics of the Russian Academy of Sciences

Author for correspondence.
Email: npktribonika@yandex.ru

Senior Research Associate

Russian Federation

I. N. Тsareva

Institute of Applied Physics of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Candidate of Science (Phys. & Math.)
Senior Research Associate

Russian Federation

Yu. P. Tarasenko

Institute of Applied Physics of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Candidate of Science (Phys. & Math.)
Head of Laboratory

Russian Federation

Ya. A. Fel’

Institute of Applied Physics of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Candidate of Science (Phys. & Math.)
Senior Research Associate

Russian Federation

Yu. K. Levanov

Research and Industrial Center Tribonika

Email: tribonikaplant@yandex.ru

Chief Engineer

Russian Federation

References

  1. Tarasenko Yu.P., Tsareva I.N., Krivina L.A., Levanov Yu.K. Application of the method of jet powder spraying for the solution of problems of mechanical engineering. Prikladnaya Mekhanika i Tekhnologii Mashinostroeniya. 2014. No. 1 (23). P. 101-113. (In Russ.)
  2. Tarasenko Yu.P., Tsareva I.N., Levanov Yu.K., Krivina L.A., Berdnik O.B., Ilyichev V.A. On obtaining intermetallide coatings by gas dynamic powder spraying. Voprosy Materialovedeniya. 2015. No. 3 (83). P. 91-99. (In Russ.)
  3. Arkhipov V.E., Londarskiy A.F., Moskvitin G.V., Pugachev M.S. Gazodinamicheskoe napylenie. Struktura i svoystva pokrytiy [Gas dynamic spraying: Structure and properties of coatings]. Moscow: Krasand Publ., 2017. 239 p.

Statistics

Views

Abstract: 1026

PDF (Russian): 463

Dimensions

PlumX

Refbacks

  • There are currently no refbacks.

Copyright (c) 2018 VESTNIK of Samara University. Aerospace and Mechanical Engineering

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies