In this work the influence of microstructure on hydrogen diffusion and impedance of interstitial free (IF) steel was studied. The permeation experiments have shown that electrochemical corrosion of IF-steel in 2M H2SO4 results in evolution and absorption of hydrogen atoms in the material. The obtained diffusion parameters indicate the connection of transport of diffusible hydrogen with traps presented in examined interstitial free steel.The analysis of experimental EIS data of examined sample carried out by model of the most common equivalent electric circuit R (QR) has shown that simulated curves match with experimental curves and that compact layer obtained on IF-steel cannot present a barrier for hydrogen diffusion because of its small thickness.By metallographic and SEM examinations the inclusions of square shape were registered and EDS analysis revealed the presence of titanium nitrides, which act as irreversible hydrogen traps towards suppression of fish-scales phenomenon in enamelling process. K e y w o r d s : interstitial free (IF) steel, hydrogen diffusion, hydrogen traps, microstructure, impedance

The use of aluminium alloys in a wide range of technical applications is related mostly to the two facts: they facilitate weight saving of final products (if compared to the steel) and they are prone to spontaneous passivity due to the coherent surface oxide layer which impedes further reaction of aluminium with the environment. Among the commercial Al alloys, EN AW-5083 alloy is a representative non-heat treatable Al-Mg based alloy which possesses many interesting characteristics as a structural material, such as low price, moderately high strength, high formability in conjunction with superplasticity and good corrosion resistance in marine atmospheres. Aiming to enhance the knowledge of possible interactions of studied alloy EN AW-5083 in as-cast condition with chloride media, electrochemical measurements were used to follow the pitting behaviour in 0.01 M NaCl. The results of tests have shown that susceptibility of alloy to pitting corrosion is strongly influenced by the microstructural constituents of the alloy in as-cast condition

The method of potentiodynamic polarization was used to obtain the electrochemical measurements of ten experimental Co-Cr-Mo alloys with different chemical composition in two solutions of 0.1 % lactic acid (LA): medium A containing Cl − -ions (0.1 % LA in artificial saliva, pH 6.52) and medium B without Cl − -ions (0.1 % LA in distilled water, pH 2.99). These solutions as representative of oral cavity conditions were chosen in order to see if the alloys could be used in dental practice. Wironit was used as reference material.In vitro experiments have shown that susceptibility to local corrosion was more pronounced in solution A. In contrast, the tendency to general corrosion was greater in solution B.Referring to pitting potential of Wironit , samples 3 (Co55CR40Mo5), 6 (Co60CR30Mo10) and 9 (Co55CR20Mo25) have shown the best performances with the highest Epitt value in both media. The same is valid for these three alloys if general corrosion was considered.K e y w o r d s : Co-Cr-Mo dental alloys, passivity, lactic acid, artificial saliva, corrosion properties

The permeation experiments performed in this study have shown that electrochemical corrosion of dual-phase steels in 2 mol L −1 H2SO4 results in hydrogen evolution and absorption of hydrogen atoms in the material, which leads to degradation known as hydrogen embrittlement (HE).The values of the diffusion coefficient and hydrogen solubility obtained in this study have shown that transport of diffusible hydrogen and high susceptibility to HE depends on different microconstituents acting as hydrogen traps in dual-phase steels. The metallographic and SEM/EDS analyses have revealed elongated inclusions in dual-phase steel marked as DP, acting as irreversible traps in the ferrite-martensite matrix. Room temperature tensile tests of hydrogenated specimens have shown degradation of elongation and contraction compared to those of nonhydrogenated ones. SEM analyses of fracture surfaces have revealed the difference between nonhydrogenated dual-phase steels with ductile fracture and hydrogenated dual-phase steels with brittle fracture.

This paper presents an overview of asbestos production data worldwide and in the Republic of Croatia in the period 2000 to 2018 as well as the asbestos consumption data from 1995 to 2010. The results of asbestos waste collection from 1995 to 2018 have been analyzed and the experiences of the Republic of Croatia in the management of asbestos-containing waste have been described in accordance with the applicable national legislation. Although asbestos does not pose a risk if its products do not become damaged by fracture, or during transportation or decomposition, it poses a potential danger to human health. In today's world, every five minutes someone dies from a disease related to asbestos, such as asbestosis and cancer caused by asbestos. For these reasons, most countries adopted the obligation to execute a series of measures to stop using asbestos in 1999, while at the same time in the Republic of Croatia still imported about 4000 tonnes of asbestos per year. In 2006, the Republic of Croatia banned the production, transport, and use of asbestos, and the asbestos objects whose lifetime expired ended up in municipal waste, causing the need for special regulations in order to arrange the management of asbestos containing waste. Over the past ten years, the Republic of Croatia has developed an asbestos waste management system. Regardless of the success of its application, certain improvements are needed, as data on the amounts of reported construction waste, and thus the part containing asbestos, do not coincide with economic and other indicators for the construction sector.