The use of magnesium and its alloys is limited due to their low corrosion resistance. In real-world conditions, it is therefore necessary to modify the surface properties of magnesium alloy products in order to prevent or significantly slow down destructive corrosion processes. This paper proposes an approach for creating anti-corrosion coatings on magnesium alloys through the use of electric arc deposition of aluminum layer on alloy surface, laser processing of this layer, followed by chemisorption of a hydrophobic agent. The resulting coating, created using this method, is superhydrophobic and has a high level of resistance to corrosion under contact with corrosive media. Long-term studies on the coating's water resistance, salt spray resistance, and immersion in a chloride-containing solution have shown that the coating has a very high chemical resistance and retains its extremely high anti-corrosive properties even after continuous contact with saline solution for two months. The effectiveness of corrosion protection provided by the developed coatings can be explained by the superhydrophobic state of their surface and the greater chemical inertness of aluminum oxide compared to magnesium oxides and hydroxides.

The aim of our experiments was to demonstrate the increase in the corrosion resistance of two stainless steels after nanolayer deposition. The questions we wanted to answer were: how the self–assembled deposition time influences the compactness of the nanolayers and how the steel composition influences the nanofilms deposition, its compactness and the anticorrosion efficiency. To answer these questions self–assembled molecular layers were prepared by dipping technique; the nanolayers were characterized by water wettability values and the two different stainless steel samples with and without nanofilms were subjected to corrosive media (sodium chloride solution). The effect of the chloride ions on the solid surfaces were visualized by atomic force microscopy and characterized by roughness parameters. The anticorrosion efficiency caused by the steel surface compositions as well as by the different self–assembled adsorption time was explained by the experimental data.

The rates of chloride deposition on the surface of the material were determined using different types of samplers, and linear correlation coefficients between the sampler data were calculated. An exponential dependence of the average annual rate of chloride deposition on the distance to the seashore was obtained. The categories of corrosive aggressiveness of the atmosphere were determined for different orientations of samples of carbon steel, zinc, copper and aluminum and at different distances from the seashore.

The protective effects of coconut oil mono- and diethanolamide (MEAC, DEAC), tall oil monoethanolamide (MEAT), sunflower oil diethanolamide (DEAP), as well as mixtures of MEAC with inorganic salts (chloride, bromide, potassium iodide and thiocyanate) during corrosion of steel in sulfuric acid. It has been established that at the studied concentrations, amides and inorganic salts provide protection of steel from corrosion in 0,5 M sulfuric acid by 70–91% and 90–94% at a temperature of 20°C, respectively. A mixture of MEAC (0,5%) with inorganic salts (0,01 M) protects steel at the specified temperature by 94–99%. As the temperature increases, the effectiveness of individual compounds and inhibitor mixtures decreases. The influence of components and their mixtures on particular electrode reactions of the corrosion process has been established. The degree of surface coverage with inhibitors and the free energy of adsorption were determined.

Paper presents the results of accelerated corrosion tests which demonstrate the effectiveness of mixed volatile corrosion inhibitors in protecting metals under the periodic influence of moisture condensation. It is shown that the volatile corrosion inhibitor IFKhAN–8B effectively protects all tested grades of steel and cast iron, while IFKhAN–118 is effective against all studied structural materials. Studies conducted to determine the ability of these inhibitors to suppress biocorrosion have revealed that the inhibitor IFKhAN–118 has a fungicidal effect, and IFKhAN– 8B is a fungistatic.

A solution has been developed for applying protective-adhesive cerium-containing coatings to the surface of the AMg6 aluminum alloy in order to replace the toxic chromating process in the automotive and other industries.

The developed solution contains: 5-10 g/l Ce(NO₃)₃·6H₂O, 30-40 ml/l H₂O₂ and 0,5-1,5 g/l tannin.

Coatings with the best physical-chemical characteristics are formed in a solution with pH=2-3 at a temperature of 18-25°C and a process duration of 10-15 minutes. The optimum drying temperature is 120-160°C.

The coatings formed under these conditions consist of cerium oxides CeO₂, Ce₂O₃ and aluminum oxide Al₂O₃. The addition of a tannin (in an amount of 0,5-1,5 g/l) to the working solution leads to a change in the chemical composition of the forming coatings, namely, to the exclusion of CeO₂ compounds in their composition. This increases the protective ability of coatings.

The developed solution for the formation of protective-adhesive coatings on aluminum is an alternative to toxic chromating solutions.

The electrochemical and corrosion behavior of copper in aqueous solutions of sodium salts of alkylmalonic acids with alkyl lengths of n_С = 0, 2, 4, 7 and 9 was studied by ellipsometry, potentiodynamic polarization and corrosion tests. Addition of alkylmalonic acid salts at a concentration of C_inh = 0.002 mol/L to borate buffer solution (pH 7.4) containing 0.01 mol/L NaCl slows down the anodic dissolution of copper, increases its local depassivation potential and inhibits the cathodic oxygen reduction. The greater the alkyl length of the inhibitor, the more expressed these effects are. It has been shown that the adsorption strength of alkylmalonate increases with increasing alkyl length and is adequately described by the full Temkin isotherm equation. The standard free energy of adsorption (–∆G⁰_a) of these anions on the oxidized copper surface at E= 0.0 V is 47.7 kJ/mol for malonic acid and 83.9 kJ/mol for nonylmalonic acid, which suggests a chemical nature of adsorption. Seven-day corrosion tests of copper in 0.01 mol/L NaCl solution performed in the presence of alkylmalonic acid salts with n = 0, 2, 4, 7 and 9 have shown that the protective effect increases both with increasing Cinh and with increasing alkyl length. In the C_inh range of 0.5–3 mmol/L the degree of copper protection by malonic acid anion increases from 26 to 76% and by nonylmalonic acid from 66 to 95% which confirms the highest efficiency of sodium nonylmalonate among the studied dicarboxylates at copper and its alloy corrosion inhibition.

The adsorption and passivation effect of 3-amino-1,2,4-triazole (3-AT) and 5-CF₃-3-amino-1,2,4-triazole (TFAT) on copper in a neutral buffer solution was studied. Both compounds are chemisorbed on the oxidized copper surface at a potential E=0 V with adsorption free energies of 57,7 and 96,6 kJ/mol for 3-AT and TFAT, respectively. The ellipsometric method confirmed the formation of the Cu(I)-TFAT complex, previously discovered by XPS and OES. The thickness of the Cu(I)-TFAT complex reaches ≈4 nm after 220 min of oxidation at E=0,35 V.

Silicone primers based on silanes are often used to increase adhesion between the metal surface and the paint coating. At the same time, it is possible to apply polymer films from organosilanes using vapor phase deposition. This method makes it possible to obtain uniform thin polymer layers with high barrier properties. In this work, the adsorption and polymerization of vinyltrimethoxysilane on the surface of the AMg3 aluminum alloy in the presence of water vapor and ethylene glycol was studied. It has been shown that ethylene glycol is an effective promoter of polymerization due to crosslinking of hydroxyl and ethanol groups during the polycondensation of silane and ethylene glycol molecules on the metal surface. Using X ray photoelectron microanalysis and corrosion electrochemical methods, the protective properties of the resulting polymer films and their interaction with the initial surface of the AMg3 aluminum alloy and oxidized in the converting composition IFKhANAL-2 were studied. It has been shown that impregnation of oxide coatings with organosilanes using the vapor phase deposition method significantly increases their corrosion resistance.

Some salts of dicarboxylic acids were investigated as corrosion inhibitors (CI) for copper in neutral chloride-containing solutions. One of them, sodium succinate, in borate buffer solution (pH 7.4) containing 10 mmol NaCl, decreases the value of passivation current density ip and increases the local depassivation potential E_ld. Mixture of alkenylsuccinic acids sodium salts (SAS) with the number of carbon atoms in the alkenyl n_C=12–15 (KAP-25) are more hydrophobic than sodium succinate and due to this show better protective properties. In the same solution, they decrease i_p at lower concentrations of Cinh and significantly increase E_ld. Another hydrophobic CI, sodium tridecanoate with n_C=12, showed better efficiency in stabilizing the passive state of copper. The passivation properties of the sodium oleate, well-known CI, also having a double bond, and SAS were shown to be close. In order to compare the efficiency of these CIs, accelerated corrosion tests were carried out in a humid atmosphere with daily condensation of moisture on copper samples passivated in aqueous solutions of SAS, sodium oleate or sodium tridecanoate. It was shown that in the absence of chlorides, the best protective properties were shown by the SAS solution, but if after passivation of copper samples they were immersed for 10 seconds in water containing 1 g/L NaCl, the protective properties of the SAS became weaker than those of sodium tridecanoate. To enhance the protection of copper by AS anions in the presence of chlorides, additives of 2-mercaptobenzothiazole (2-MBT), capable of forming hard-soluble complexes with Cu(I), were used. Studies were carried out by electrochemical impedance spectroscopy (EIS) and by corrosion tests. It was shown that in the 3.5% NaCl solution containing only SAS, the obtained hodographs were described by the equivalent electrical scheme of Randles-Erschler, and in the presence of 2-MBT the R_c–C_c chain characterizing the properties of the formed complex layer was added. Comparison of the calculated R_c values made it possible to identify the best CI compositions. It was shown that small additions of 2-MBT significantly enhance the protective effect of SAS, and a synergistic effect is observed: the composition of these CIs can be more effective than 2-MBT itself, which is little soluble in neutral media. The conclusion about mutual strengthening of copper protection by these CIs was confirmed by corrosion tests.