Estimating the First-year Corrosion Losses of Structural Metals for Continental Regions of the World

Abstract

The knowledge of the first-year corrosion losses of metals (K1) in various regions of the world is of great importance in engineering applications. The K1 values are used to determine the categories of atmospheric corrosivity, and K1 is also the main parameter in models for the prediction of long-term corrosion losses of metals. In the absence of experimental values of K1, their values can be predicted on the basis of meteorological and aerochemical parameters of the atmosphere using the dose-response functions (DRF). Currently, the DRFs presented in ISO 9223:2012(E) /1/ standard are used for predicting K1 in any region of the world, along with the unified DRFs /2/ and the new DRFs /3/. The predicted values of corrosion losses (K1pr) of carbon steel, zinc, copper and aluminum obtained by various DRFs for various continental regions of the world are presented. In this work we used the atmosphere corrosivity parameters and experimental data on the corrosion losses of metals for the first year of exposure (K1exp) for the locations of the tests performed under the international UN/ECE program, the MICAT project, and the Russian program. For the first time, a comparative assessment of the reliability of various DRFs is given by comparing the values of K1pr and K1ex using graphical and statistical methods. The statistical indicators of reliability of predicting the corrosion losses of metals are calculated for various categories of atmosphere corrosivity. It is shown that the new dose-response functions offer the highest reliability for all categories of atmosphere corrosivity.

Corrosion resistance of structural metals depending on the sample orientation and initial exposure conditions in coastal and rural atmospheres. Part 1. Corrosivity toward structural metals at coastal and rural test sites under various exposure conditions

“…At present, models (DRF) for C 1 forecast applicable to any continental and coastal areas are presented in the standard [30] (DRF S ) and, for the continental regions worldwide, in [41] (DRF N ). The reliability of the predicted C 1 values for DRF S and DRF N in continental territories of the world was assessed in [24,25,41]. In [42], an updated DRF N for coastal atmospheres was suggested with the reservation that it can only be used in the first approximation for Russia's sea coasts.…”

“…The dispersion of C 1 values obtained in this study with the samples oriented in just two orientations, Figures 5-9, confirms that the development of a model suitable for prediction of C 1 values in any coastal area at various orientations and times of exposure beginning a challenging problem. At present, models (DRF) for C 1 forecast applicable to any continental and coastal areas are presented in the standard [30] (DRF S ) and, for the continental regions worldwide, in [41] (DRF N ). The reliability of the predicted C 1 values for DRF S and DRF N in continental territories of the world was assessed in [24,25,41].…”

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

“…New DRFs were originally reported in earlier studies [9,10]. Later, the coefficients were modified in the DRFs for steel, zinc and copper for the parameters T and Prec (see below), resulting in an improvement in the DRFs for continental locations with both T > 10°C and T ≤ 10°C [11][12][13].…”

The Study of Metal Corrosion Resistance near Weld Joints When Erecting Building and Structures Composed of Precast Structures

“…Articles [5,6] discuss the chemical and thermal treatment of steel in low-melting solutions. The authors of article [7] compare the data on corrosion in different continental regions on Earth. Paper [8] is devoted to the repair of a precast reinforced concrete residential building.…”

“…Currently, conducted research mostly affects the phenomena of atmospheric corrosion, a good example of this is the extensive and scrupulous work in [7]. As experience in the operation of precast concrete buildings shows, over time, various difficult-to-remove defects occur in concrete, which cause the corrosion of the reinforcement [8].…”