НЕКОТОРЫЕ ФАКТОРЫ, ВЛИЯЮЩИЕ НА ЭФФЕКТИВНОСТЬ ПРИМЕНЕНИЯ ИНГИБИТОРОВ КОРРОЗИИ

Abstract

Background Corrosion of metals and alloys in corrosive environments causes huge damage to metal equipment. In developed countries, direct corrosion losses amount are about 2-5 % of the national income. Inhibitory protection is effective and technologically uncomplicated. A number of inorganic and organic substances have an inhibitory effect on metals, primarily on steel. The effectiveness of corrosion inhibitors is affected by many factors. But there is practically no data on how the protective effect of corrosion inhibitors depends on the state of the metal surface of the equipment and the type of its heat treatment. Aims and Objectives Determine the degree of protection of the corrosion inhibitor depending on the state of the samples surface. Prepare the surface of some samples according to State Standard, of others - to grind with coarse sandpaper, and to use third ones without mechanical treatment with corrosion products on the surface. Determine the effect of the type of heat treatment (normalization and annealing of the 2nd kind) on the protective ability of the corrosion inhibitor. Methods Samples of steels 20 and 40X were used for testing. A study of corrosion rate of samples and the determination of corrosion inhibitor efficiency were carried out in accordance with State Standard 9.502-82. The essence of the gravimetric method is to determine the loss of mass of metal samples during their stay in the tested medium. According to gravimetric method, the corrosion rate is characterized by a mass index Km, g/(m2 per hour). Results The surface state of the samples has an effect on the protective ability of the corrosion inhibitor. The cleaner the surface, the higher the protective effect. A rusty or rough surface will not be adequately protected by a corrosion inhibitor. The type of heat treatment of the samples affects the corrosion rate of the samples as a function of the concentration of the inhibitor. Of greater interest is that the degree of inhibitor protection does not depend on the type of heat treatment.