Investigation of the influence of moisture moisture on its corrosive aggression
DOI:
https://doi.org/10.31548/energiya2018.03.145Abstract
Analysis of recent research and publications. The destruction of metal constructions and structures in the ground or soils (layers that lie underground and do not contain organic matter) are called underground corrosion. Today, in the world, only 30% of the metal stock produced in the history of humanity is eaten. The remaining billions of tons disappeared mainly due to corrosion. The soil has a heterogeneous structure. It consists of solid, liquid and gaseous phases. The solid phase forms a skeleton of soil, consisting of particles of different sizes. The main granulometric elements are gravel (from 40 to 2 mm), sand (from 2 to 0,05 mm), clay (from 0,001 to 0,0025 mm) [1]. The volume of voids formed at the same time characterizes the porosity of the soil. The porosity of the soil depends on its ability to absorb water. Water contained in the soil may be in three aggregate states: liquid, vaporous and solid.
Operating in the then USSR, GOST 9.015-74 recommended to assess the corrosive activity of soils in relation to underground metal structures (in those cases where they do not have mandatory cathodic protection) by the magnitude of the specific electrical resistance of the soil, the weight loss of the samples and the density of the polarizing current. Therefore, the determination of the value of the specific electrical resistance of the soil in combination with the soil moisture content is one of the main tasks in an electrochemical study to protect underground metal structures.
The purpose of the work – investigation of the effect of soil moisture on the corrosive aggressiveness of the soil.
Materials and methods of research. The theoretical and experimental component of electrochemical research was carried out at the installation to determine the value of the specific electrical resistance of the soil in the laboratory under the electrical circuit according to GOST 9.602 - 2016.
Conclusions.The results of researches on determination of the specific electrical resistance of the soil, depending on the soil moisture content, which is a significant factor of soil corrosion of metals, is presented. On the basis of the classification of corrosion activity of soils in a five-point system, a correlation was established between the degrees of corrosion activity and soil moisture for loam and sand. Increasing the moisture content of sand from 10 to 40% practically does not cause an increase in the rate of corrosion, corrosion activity is low. For loam already at a humidity of more than 10% corrosive activity progresses from low to high. At a humidity of 30-40%, the maximum speed of the corrosion process is observed.
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