This paper describes mechanical properties and chemical resistance of cemented carbides. A detailed overview of surface engineering of cemented carbides is given. The paper also lists the advantages and disadvantages of the most common coating technologies. A review of previous research on the modification of cemented carbides is provided. The boriding process with emphasis on boriding in powder is described. In the experimental part of the paper samples of WC-CO cemented carbide were used. They were subjected to heat treatment containing degasification and boriding at the Heat Treatment Laboratory of the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb. Surface preparation for metallographic analysis and microstructure analysis using light microscope were performed at the Metallography Laboratory of the Faculty of Mechanical Engineering and Naval Architecture of the University of Zagreb. Chemical composition analysis of the samples was performed at the Electron Microscopy Laboratory of the Faculty of Chemical Engineering and Technology of the University of Zagreb. The examinations of the samples revealed insignificant microstructure modification after boriding compared to the initial state and no boriding layer was created on surface.