Diffusion zinc coatings in the system of corrosion protection of tubes and fasteners for structural elements

Study of protective properties of diffusion zinc coatings (DZC) on tubes and fasteners for structural elements under mechanical loads applied to threaded tube joints in weak corrosive media. Procedure. As a material for this research work, diffusion zinc coated high-strength bolts М24 were taken. Electrochemical behavior of zinced specimens was studied under action of mechanical loads. It was established that the rate of anodic dissolution of zinc coating grows significantly with the growth of mechanical loads applied to the specimens. Results obtained. Based on the obtained data, it was shown that the dissolution rate of stressed specimens at a load level of 0.8 ?в and equal positive potentials gets 2.5 to 3 times higher than that for unstressed specimens. Scientific novelty. Regularities of corrosion behavior of diffusion zinc coatings of a new generation applied on metal products working in stressconditions were established. Practical significance. Appreciation of the mechanism and acquisition of qualitative regularities of the corrosion process in protective diffusion zinc coatings with the objective of improvement of service life and reliability of tubes and fasteners for structural elements.