Inhibition of Magnesium Corrosion by Salts of Higher Carbonic Acids

The effect of sodium salts of some higher carboxylates on anodic magnesium dissolution in the borate buffer solution (pH 7.4) has been investigated. It has been demonstrated that the best protective and passivating properties characterize sodium oleate (SOL). The high protective properties of SOL were corroborated in tests of Mg plates under conditions of humid atmosphere with daily humidity condensation. Preliminary Mg passivation in an aqueous solution of 16 mmol/L of SOL provides protection from the emergence of the first corrosion damage for 18–20 h, which is six times more efficient than the chromate treatment at the same concentration.     

Adsorption of Sodium Oleyl Sarcosinate on Zinc and Its Passivating Action in Neutral Aqueous Solution

Protection of Metals and Physical Chemistry of Surfaces - The adsorption, protective, and passivating effect of some sodium salts of higher carboxylates and sodium dioctyl phosphate on zinc in...     

Protection of D16 Alloy against Corrosion in Neutral Aqueous Solutions and in an Aggressive Atmosphere Using Organic Inhibitors

The possibilities of protecting the aluminum alloy D16 with organic corrosion inhibitors are considered. The protective ability of the obtained nanoscale layers was evaluated by an express method (drop test), tests in a heat and moisture chamber, salt spraying, and electrochemical impedance spectroscopy. The efficiency of treating D16 in aqueous solutions of organic inhibitors is correlated with the protective ability of chromate films.

     

Protection of low-carbon steel in aqueous solutions by lignosulfonate inhibitors

The corrosion and electrochemical behavior of low-carbon steel and iron in a neutral aqueous solution containing ZnHEDP, lignosulfonates LS1 and LS2, and their mixtures was studied. Corrosion tests showed that these lignosulfonates stimulate corrosion at room temperature but act as weak inhibitors at 80°C. However, adding LS1 and LS2 to ZnHEDP enhanced the steel protection by the latter; a synergism of their protective effects was observed at certain ratios of the complexonate and polymers. Although LS1 and LS2 are compounds of the same type, their effects on steel corrosion in a neutral aqueous solution containing ZnHEDP differ substantially: LS1 favors the inhibition by ZnHEDP of the cathodic reaction only, while LS2 affect both electrode reactions. Original Russian Text ? A.A. Chirkunov, Yu.I. Kuznetsov, M.A. Gusakova, 2007, published in Zashchita Metallov, 2007, Vol. 43, No. 4, pp. 396–401.     

Surface Modification of Aluminum Alloys by Two-Stage Passivation in Solutions of Vinyltrimethoxysilane and Organic Inhibitors

Protection of Metals and Physical Chemistry of Surfaces - The protective ability of films formed on Al alloys from solutions of vinyltrimethoxysilane and organic corrosion inhibitors, such as...     

Protection from corrosion and deposits for water-cooling systems in oil processing plants

Factors are noted that affect the formation of mineral and microbiological deposits in water circulation supply systems of oil processing plants (OPP). The most widespread measures are considered for protection from biodeposits; chlorination using hypochlorite; water treatment with copper sulfate; water treatment with organic biocides. Results are provided for a study of protection of OPP water systems from corrosion using different corrosion inhibitors of complex action.     

Heat flux to the bottom of a liquid-heated reactor

On the basis of the fundamental conservation laws, a mathematical model is developed to describe the heating of the flat bottom of a cylindrical reactor by a heating jacket where the liquid is fed to the center of the bottom. The results obtained can be used in thermal design of reactors in which the process is performed at constant temperature of the working medium and the outer wall of the heating jacket is heat-insulated.Translated from Teoreticheskie Osnovy Khimicheskoi Tekhnologii, Vol. 38, No. 6, 2004, pp. 655–660.Original Russian Text Copyright © 2004 by Ananikov, Sorokin, Burdikov, Chirkunov.     

New Atmospheric Corrosion Inhibitor of D16 Aluminum Alloy

Protection of Metals and Physical Chemistry of Surfaces - Abstract—A mixed corrosion inhibitor (CI), which is an equimolar composition of sodium oleyl sarcosinate (SOS) and sodium...     

Inhibition of anodic dissolution of low-carbon steel with alkyl phosphonates in borate buffer solution

Anodic behavior of a low-carbon steel in a borate buffer solution containing C _n H_{2n + 1}PO₃Na₂ sodium alkyl phosphonates with n = 7?C10 is studied. The passivating ability of alkyl phosphonates is shown to depend on the length of the hydrocarbon radical of the inhibitor and the exposure of the steel in the solution.     

The Formation of Passive Films on Magnesium in Alkaline Solutions and Adsorption of Anions of Organic Acids on Them

Protection of Metals and Physical Chemistry of Surfaces - The growth of oxide films on the surface of magnesium in 5M NaOH and a borate buffer solution with pH of 11.2 is studied. The thickness of...