Corrosivity of atmosphere toward structural metals and mapping the continental Russian territory

Abstract

The corrosivity of atmosphere in the continental territory of Russia toward carbon steel, zinc, copper and aluminium was determined and estimated. The atmosphere corrosivity was determined from experimental data on first-year corrosion losses in representative test locations. The atmosphere corrosivity was estimated using first-year corrosion losses of structural materials calculated by means of dose-response functions: new ones (DRF N ) and those presented in ISO 9223 (DRF S ). Estimation of atmosphere corrosivity in the Russian Federation (RF) territory was performed using the data bank of the Institute of physical chemistry and electrochemistry of the Russian Academy of Sciences containing long-term annual average meteorological atmosphere parameters. The mapping of RF continental territory by categories of atmosphere corrosivity is presented. The atmosphere corrosivities estimated by DRF N and DRF S for each metal are compared. It has been shown that DRF N provides more reliable atmosphere corrosivity estimates.

Application of the random forest algorithm to predict the corrosion losses of carbon steel over the first year of exposure in various regions of the world

“…It should be noted that the continental data set of RUS DB consists of data obtained in a cold climate (the Т range was from +3.6 to −16.6°С) with a small amount of atmospheric precipitation ( Prec ≤ 626 mm year –1 ) and a small amount of corrosive pollutants in the air ([SO 2 ] ≤ 10 μg m –3 ) [30]. It is apparent that the versatile RF models developed on the basis of combined DBs and intended to predict C 1 values in various regions of the world cannot be sufficiently accurate in predicting the corrosion losses of a metal in a specific climatic region due to the small number of samples with extreme values of features in the combined database.…”

Estimation of long-term corrosion resistance of structural metals and mapping the continental territory of the Russian Federation for various time periods

“…The C 1 values and long-term corrosion metal losses ( R ) were determined in the continental territory of Russia for 6213 ‘cells’ sized 0.5° latitude by 1° longitude. Each ‘cell’ is characterised by a set of annual average long-term meteorological data that constitute the IPCE RAS databank [14]. The background concentration of sulphur dioxide [SO 2 ] at these territories is assumed to be 3 μg m −3 .…”

“…Mapping was based on the C N 1 and C ISO 1 values, as well as C New t and C ISO t , which allows one to estimate their differences. C 1 ranges for the first year correspond to the ranges of atmosphere corrosivity, taking into account the additional subcategories for category C 2 suggested for the territory of Russia [14]. Thus, based on the maps for the first year, one can estimate the atmosphere corrosivity of a required location for each metal.…”

Corrosion Resistance of Zinc and Zinc-Aluminum-Magnesium Coatings in Atmosphere on the Territory of Russia

“…For ZnAlMg and HDG coatings, we used the categories defined for zinc as a first approximation, and for the atmosphere under a shelter, we used the categories for open atmosphere. Taking into account that the atmosphere corrosivity in most of Russia's territory is in category C2, additional subcategories of C2-1, C2-2, and C2-3 were introduced [30].…”