Фундаментальные и прикладные проблемы черной металлургии

DOI: 10.52150/2522-9117-2026-40-012

T. V. Kimstach1,*, Ph. D. (Tech.), Assoc. Prof., ORCID 0000-0002-8993-201X
S. I. Repyakh1,D. Sc. (Tech.), Professor, ORCID 0000-0003-0203-4135

1 Ukrainian State University of Science and Technologies
* Corresponding author: t.v.kimstach@ust.edu.ua

CORROSION OF BRONZES IN HUMID AIR AND SALT FOG

Abstract. Introduction. Corrosion is a widespread issue that is particularly critical for metal products. The consequences of corrosion may include social and environmental problems, accidents, and man-made disasters, among others. One of the approaches to addressing this problem is the use of structural bronze for manufacturing cast products, as it is resistant, particularly in natural gaseous environments. Problem. A promising bronze in this regard is the new structural non-magnetic bronze BrA7K2O1,5Mts0,3, whose corrosion resistance has not yet been studied. Purpose. To determine the kinetics and rate of unrelated corrosion in humid air and salt fog at 40 °C for bronzes of grades BrA10Zh4N4, BrA9Zh3L, BrO6Ts6S3, as well as BrA7K2O1,5Mts0,3 bronze before and after heat treatment. Materials and Methods. The study used cast samples of Ø40×10 mm made of BrA10Zh4N4, BrA9Zh3L, BrO6Ts6S3 bronzes, as well as BrA7K2O1,5Mts0,3 bronze before and after heat treatment. Corrosion kinetics were determined by measuring the change in sample mass over a period of 28 days. The mass of the samples was measured using analytical scales. The corrosion rate was calculated taking into account the density of the bronze in the samples, which was determined based on the results of hydrostatic weighing in water. Results. In humid air at 40 °C (according to accepted research methodology), all the bronzes used in this study are completely resistant. In salt fog at 40 °C, among the investigated bronzes, according to the ten-point corrosion resistance rating scale, BrA10Zh4N4 bronze has a resistance rating of 1, BrA7K2O1,5Mts0,3 bronze has a rating of 1–2, BrO6Ts6S3 bronze has a rating of 4, and BrA9Zh3L bronze has a rating of 5. A characteristic feature of the corrosion kinetics of all bronzes in humid air, as well as some bronzes in salt fog (except for BrA9Zh3L and BrO6Ts6S3), is the passivation of their surface after a certain period of exposure under the established conditions and environments in the study. Conclusions. The obtained data make it possible to assess the potential and feasibility of using cast products made of corrosion-resistant non-magnetic bronze BrA7K2O1,5Mts0,3 as a substitute for aluminum-based magnetic and non-magnetic tin-based bronzes. The use of cast parts made from this bronze will expand technical and operational capabilities, improve the reliability and durability of existing or newly developed equipment, devices, and other applications.

Key words: bronze, humid air, salt fog, corrosion, kinetics, corrosion rate, cast products.

For citation: Kimstach, T. V., & Repyakh, S. I. (2026). Corrosion of bronzes in humid air and salt fog.Fundamental and applied problems of ferrous metallurgy, 40, 195-212. https://doi.org/10.52150/2522-9117-2026-40-012

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Рукопис надійшов до редакції / Received 13.03.2026
Рекомендовано до друку / Accepted 28.05.2026
Опубліковано / Published 30.05.2026

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