Predicting the durability of zinc coatings based on laboratory and field tests

Abstract

Galvanizing is one of the most common methods of corrosion protection. For the deposition of zinc coatings used such methods as gas-thermal deposition, thermal diffusion saturation in powder, hot-dip galvanizing, cladding, and galvanic precipitating during electrolysis. The hot-dip galvanizing is the most common method, which is used in construction, automotive and other industries. Paper presents the results of research of zinc coatings used in sea conditions. The aim of the work was to determine an acceleration factor by comparing the corrosion rate in laboratory conditions with the data from field tests. Laboratory studies were carried out in a salt fog chamber. Samples were periodically removed from chamber to build the dependence of the corrosion rate on the exposure time. Field tests were carried out at the exploitation area. Result of the work is a guide that allows to predict the corrosion rates of zinc coatings using laboratory tests. The advantage of this test method is shorter time of exposure in comparison with field test.

Parabolic Model for Optimum Dry Film Thickness (DFT) of Corrosion Protective Coatings

“…Durability was given in the cited article as service life of coating measured in years. In Kovalev et al [28], a model was given, which was used for predicting the durability of zinc coatings based on laboratory and field test in which the durability was also expressed as service life of coating expressed in years. Similarly, Karimbaev [29] proposed durability model for composite materials in fatigue test.…”

Surface Modification of Nickel Oxide (II) Thin Films Obtained by Gas-Phase Deposition

“…Current technologies for producing nickel oxide (II) thin films on different substrates by physical and chemical methods from both the gas and liquid phases differ in the principle of interaction during deposition, and accordingly, they can have various structural modifications. Electrochromic properties, operating life and stability of electrochromic properties of nickel oxide compounds will be determined by the detailed features of their synthesis and are a multifunctional task [4][5][6][7].…”