Effect of compositions of active electrolytes on properties of anodic carburization

The studies were devoted to the effect of concentrations of ammonium chloride and carbon-containing additives on the depth of martensite layer formed after anode carburization of low-carbon steels. The carbon potentials of electrolytes were determined to contain ammonium chloride (10 wt %) and 10 wt % of a carbon-containing component (acetone, glycerin, ethanol, propanol-2, ethylene glycol, saccharose). Nuclear proton backscatterring was applied to determine the concentration distribution of oxygen, carbon, and nitrogen in the surface layer of some structural steels modified by heating in electrolyte containing 10% ammonium chloride and 20% of carbamide. The capability of surface strengthening of 12Kh18N10T steel due to its carburization without the hazard of intercrystalline corrosion was demonstrated.