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.
Highlights
The hot galvanizing method is one of the most common and effective methods corrosion protection method of steel metal structures [1]
To verify the reliability of the proposed method for predicting coatings deposited on steel products by hot dip galvanizing, we studied galvanized samples that underwent full-scale climatic tests directly at the site of construction of the facility during the year
It is shown that the corrosion mechanism of the hot dip galvanizing coating during field tests is similar to the mechanism of corrosion of the zinc coating in salt spray chamber in laboratory tests 3
Summary
The hot galvanizing method is one of the most common and effective methods corrosion protection method of steel metal structures [1]. This is due to the fact that zinc is the anode to most metals used in corrosive environments. One of the common types of tests for assessing the corrosion resistance of coatings in a marine atmosphere is the salt spray test. The results obtained during the tests in the salt spray chamber allow us to qualitatively compare different types of coatings, but do not answer the question about the durability of the zinc coating of a certain thickness in real conditions. The presence of the results of field tests of zinc coatings allows us to calculate their durability
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