The article discusses the relevance and objectives of the journal "Corrosion: Protection of Materials and Research Methods". The history of corrosion research at the IPCE RAS is presented, along with a brief description of the studies conducted by laboratories representing the corrosion research direction of the IPCE RAS.
A review of literature data obtained as a result of long-term testing of zinc, zinc–aluminum and zinc–aluminum–magnesium coatings on carbon steel in a number of countries (Spain, Portugal, France, Germany, former Czechoslovakia, Austria, Sweden, the Netherlands, USA, China, Japan, Mexico, Brazil, Thailand, Singapore, United Arab Emirates). Corrosion data for coatings are grouped by test depending on the corrosivity category of the atmosphere (according to standard ISO 9223) and its type (rural, urban/industrial, marine, marine/urban). It is shown that corrosion resistance of alloy coatings is higher than that of zinc coatings. In an atmosphere of low corrosiveness, passivation of the coating surface has an additional positive effect. Possible intervals of the steady–state corrosion rate of coatings for each category depending on the type of atmosphere are presented, which make it possible to estimate the service life of coatings as a first approximation. A critical assessment of the technique of conducting field tests of zinc–based coatings is given.
Corrosion of copper in acetic acid solutions freely aerated by air was studied depending on its concentration and the duration of contact of the metal with an aggressive medium. There are no fundamental differences in the aggressiveness of this medium with respect to copper in the transition from static to dynamic experimental conditions. Aggressiveness of the studied media in relation to metallic copper increases the accumulation of the corrosion product in them, Cu(II) acetate. This effect is most pronounced when metallic copper comes into contact with a dynamic corrosive medium. A mixture of quaternary ammonium salts (catamine AB) and a triazole derivative (IFKhAN-92) were studied as copper corrosion inhibitors in acetic acid solutions. The highest protective effect is provided by the additive IFKhAN-92. The effectiveness of this inhibitor does not significantly depend on the duration of contact of the metal with the aggressive medium, the content of H3CCOOH in it, and the hydrodynamic characteristics of the solution. The IFKhAN-92 inhibitor retains its protective action against metallic copper even in the case of accumulation of a corrosion product, Cu(II) acetate, in a corrosive environment. It is important that this effect is preserved when moving from static to dynamic environments. The influence of the convective factor on the corrosion of copper in an acetic acid solution containing Cu(II) acetate, both in the absence and presence of corrosion inhibitors, is considered.
Lately, more attention has been paid to the recycling of materials and the use of secondary products in final products. This also applies to metals, including aluminum and its alloys. One of the aluminum alloys made from recycled metal is 1105alloy. It has low corrosion resistance; therefore it is used in cold, dry climates, at zero and negative temperatures. In this work, modern inhibited IFKhANAL conversion coatings to protect 1105 alloy were studied. They should allow to be used this alloy in different climatic zones. For this, electrochemical studies and field tests of coatings in an urban industrial atmosphere and in a tropical climate were carried out. It is shown that coatings can protect 1105 alloy up to 1 year and when using acrylate pain system – more than 1 year.
This paper summarizes the current understanding of tungsten and its alloys in the context of their use as corrosion-resistant materials and corrosion-resistant coatings. The basic properties of systems based on tungsten and its alloys are presented, including structural, physical and mechanical, and chemical characteristics. Particular attention is paid to corrosion resistance and methods of obtaining tungsten-based materials and coatings.
The protective effect of chamber steel corrosion inhibitors based on lauric acid has been studied by electrochemical and corrosion methods. It has been established that its protective effect can be enhanced by additives of octadecylamine, as well as octadecylamine and benzotriazole or its derivatives-tolyltriazole and chlorobenzotriazole. The mechanism of action of all studied compositions and their components is blocking-activating, with a predominance of activation. The protective effect of the studied mixture inhibitors considerably exceeds the protective effect of the components. Nevertheless, an analysis of the mutual influence of the components indicates the absence of their synergistic interactions. It was shown by ellipsometric methods that adsorption of the studied inhibitors inhibits or prevents oxide growth on steel during chamber treatment. During chamber treatment of steel with the studied inhibitors nanosized adsorption films are formed on its surface. There is no unambiguous correlation between their thickness and the protective effect of chamber inhibitors, but the most effective compositions are characterized by the thickness of the adsorption layers of 10 nanometers or more.
