CALCULATION OF THERMODYNAMIC CONDUCTANCE COEFFICIENTS USING A RELATIONSHIP INCLUDING IONIC MOBILITIES

Relationships have been derived to describe the thermodynamic conductance coefficients by combining the thermodynamic equation and the Debye-Hückel-Onsager description of the ionic mobilities. The relationships can be used for calculating the thermodynamic conductance coefficients Lkk, Laa and Lka

CORROSION AND ELECTROCHEMICAL RESEARCHES

We wish to introduce the work of the research group for corrosion and electrochemistry of Institute of Inorganic Chemistry, Technical University of Budapest. The main fields of our investigations were the electrogalvanizing of palladium-nickel alloy-coatings, the study of the sealing of the anodic oxide-layers, the corrosion-resistance of titanium-carbide steel- alloys, the effectiveness of inhibitors protecting the steel reinforcement of cellular concrete and the study of the corrosion effect of chemical agents used for salting winter roads

КОРРОЗИОННАЯ СТОЙКОСТЬ НЕРЖАВЕЮЩИХ ПОРОШКОВЫХ ТВЕРДЫХ СПЛАВОВ TiC-СТАЛЬ. Korrozionnaâ stojkost' neržaveůşih poroškovyh tverdyh splavov TiC-stal'

Corrosion properties of powder metallurgical solidy alloys made of high wear resistance TiC and of corrosion-proof steel has been investigated in NaOH solution of 20% conc., in 10% HNO3, in 3% H2SO4 and in 44% H3PO4 solutions. The corrosion of solid alloys is deteriorating not only the metal, but also reduces its wear resistance. Our preliminary experiments performed with some corrosion-proof steels disclosed that the corrosion resistance of solid alloys made of nickel-free steels with high chrome content is poor. Solid alloys produced of austenite chromonickel steels with TiC proved to be acceptable. These solid alloys did not corrode at all in NaOH, as well as in acidic solutions. In the presence of inhibitors their corrosion resistance is further improved

КОРРОЗИОННАЯ СТОЙКОСТЬ И ИЗНОСОСТОЙКОСТЬ ПОРОШКОВЫХ ТВЕРДЫХ СПЛАВОВ НА ОСНОВЕ КАРБИДА ТИТАНА И ХРОМИСТОЙ СТАЛИ. Korrozionnaâ stojkost' i iznosostojkost' poroškovyh tverdyh splavov na osnove karbida titana i hromistnj stali

TiC-Fe-Cr alloys prepared from titanium-carbide and steel basis metal by powder metallurgy were studied with concerning their corrosion and abrasion resistance in water. Such alloys is used for preparing of pieces exposed to corrosion. Our experiments have indicated that the abrasion is not independent for corrosion resistance. By weak corrosion resistance abrasion decreases too because that the corroded metal do not bound together the hard titanium-carbide grains. Good abrasion is only by good corrosion resistance attainable. The corrosive abrasion is dependent on the hardness only in the case of suitable corrosion resistance of the solid alloys