Studies of the effect of water addition (1% – 25% obj. H2O) on the anodic dissolution of zinc and the nature of dissolution products, at high potential values, were performed. The dissolution products were analyzed by spectroscopic UV-vis methods, scanning microscopy (SEM/EDS) and X- ray diffraction techniques.

This paper presents the results of the behavior of ferritic steel of the Crofer 22 APU type in the air and argon atmospheres containing water vapor at high temperatures. The effect of water vapor content on the kinetics of oxidation at 800°C has been examined. Water vapor content ranged 1–100%. The total exposure time was 100 h. The total exposure time of each sample was 100 h. The phase and chemical compositions of the formed scales were investigated by XRD and SEM/EDS. The rate of oxidation of steel Crofer 22 APU depends on the content of water vapor in the atmosphere at a temperature of 800°C. The phase and chemical compositions in practically all studied atmospheres were the same.

The local electrochemical behavior of AlCu4Mg1 aluminium alloys is presented in this paper. The microstructure infl uence on corrosion behavior was investigated. The electrochemical measurements were performed in 0.1 M chloride water solution. In order to investigate corrosion resistance of the alloy in microregions the Electrochemical Microcell Technique (EMT) was used. The places contains particles P1 (Al2Cu) type exhibit cathodic character and higher electrochemical activity compared do sites where P2 (Al-Si-Mn-Fe-Cu) type particles and pure matrix were present. EMT allows also to determine differences in the matrix corrosion behavior, where heterogeneities in structure were observed. By means of the microelectrodes it was possible to confi rm, that in anodic sites pH value is lower than in cathodic sites.

Cleanliness of the steel substrate prior to painting plays a very important role in the protection of the steel substrate against corrosion. It is assumed that in practice the specifi c level of contaminants is acceptable. The aim of this study was to examine and compare coating durability when the contamination level exceeds slightly the critical level of surface preparation requirements. Durability studies were performed using epoxy coating system with a thickness of about 160 μm applied on steel substrate which has been prepared by blast cleaning to grade Sa 2½, and as well as hand and power tool cleaning to grade St3. Other were prepared by blast cleaning and contaminated with dust, moisture, and soluble salts. The evaluation was performed using the impedance studies conducted during the period of 1 year.

This work deals with investigations of hydrogen effect on the structure of the ordered FeAl intermetallic phase that was registered with intensity changes of diffraction lines in the XRD patterns. Material under investigation was obtained using the vacuum metallurgy method. Both the planned and after chemical analysis composition of the Fe-50 at. %Al phase was presented. It was ascertained that hydrogenation of the Fe- 50 at. % Al phase causes the change of diffraction lines what is probabely connected with the decrease of structure degree of order. Samples after seasoning for 72 h retain hydrogenation effect. In case of the sample hydrogenated for 3, 6, 12, 16 and 48 h, after grinding of the thickness 0.2 mm the return to initial state did not occur what proves that hydrogen has penetrated deep into the material. The Fe-50 at. % Al phase hydrogenated and kept in liquid nitrogen as well as after seasoning for 508 h, retain hydrogenation effect.

The infl uence of the concentration of N-(2-chlorobenzylidene)-4-acetylaniline (CBAA) on the corrosion of X5CrNi18-10 austenic steel in chloride acid solutions was studied by potentiodynamic polarization methods. The corrosion inhibition effi ciency of steel increased with an increase in the concentration of CBAA and temperature. The CBAA acted as a mixed-type inhibitor. The adsorption of N-(2-chlorobenzylidene)-4- acetylaniline has been found to occur on the surface of steel according to the Langmuir isotherm at all studied temperatures. The kinetic and thermodynamic parameters for X5CrNi18-10 corrosion and CBAA adsorption, respectively were determined and discussed. The chemisorption and physisorption for the inhibitor on steel surface was suggested.

In this work, the results concerning an assessment of corrosion resistance of the ordered FeAl intermetallic phase of different Al content (37, 40, 43, 46, 50 at.%) to effect of neutral salt fog according to PN-EN ISO 9227:2007 standard, were presented. Validation of the applied testing method using CR4 steel standard samples In accordance with ISO 3574 standard, was carried out. Corrosion products were removed after exposure of 48 h using mechanical and chemical cleaning, and then, the rate of mass loss per surface unit, was determined. Discussion on sources of measurement uncertainty was presented. Characteristics of the investigated phase was realized using scanning electron microscopy and X-ray diffraction. It was ascertained that with increase in Al content in the tested phase its resistance to effect of neutral salt fog increases. Suggested reason for such changes is the presence of Al2O3 on the surface with strong barrier properties.

The methods used in practice for the study of interferences caused by stray currents on underground pipelines are discussed. Exemplary test results and analysis of electrolytic corrosion hazard, that was performed during diagnosis of steel gas distribution networks operated by the MSG Gas Company Ltd., was presented.

Electrochemical behavior of Fe-5%Cr alloys has been investigated in aqueous solution of 0.1 M Na2SO4 and in thermal water from Bańska IG–1 well (Geotermia Podhalańska S.A.). The aim of the investigations was to explain the formation mechanism of surface corrosion product. The layer formed on the metal surface determines relative good corrosion resistance of P5 steel in thermal waters with medium salinity in temperature range up to 100oC. The mechanism and kinetics of the formation of the anodic surface fi lm, on the Fe-5%Cr alloy and on the cast steel P5 has been presented.

The paper presents the study of electrochemical properties of iron in anhydrous solutions of lithium perchlorate in ethanol and n-propanol. Investigation were performed by means of cyclic woltammetry. In lithium perchlorate – alcohol solutions iron undergoes passivation. Addition of lithium chloride limits passive range to the potential range of stability of Fe2+ compounds.

Paper presents the specifi cation of structure of automatic corrosion monitoring system in explosion-proof area. Legal requirements demanded in explosion-proof area have been also discussed. Results of testing researches have been detail presented in the paper.

This article presents the results of work on the use of a rotating disc electrode (RDE) in electrochemical studies of the process of hydrogen evolution on porous nickel electrodes. The scope of investigation included obtaining porous Ni sinters by oxidation and reduction method, characterisation of metallic sinters with the use of SEM/EDS, BET methods and the preparation of porous electrodes for use with RDE devices. The investigations included the characterization of electrochemical hydrogen evolution process on porous Ni electrodes in the environment of 1 mol KOH solution relative to the Hg|HgO electrode under stationary conditions and use of RDE at speeds from 0 to 2000 rpm. It was found that the use of rotational speed above 1600 rpm enables the measurement of polarization curves avoiding artefacts resulting from the desorption of hydrogen gas from the porous electrode surface.

Corrosion behaviour of plasma carbonitrided stainless steel S31603 was studied. The carbonitriding process was performed using the plasma assisted chemical vapour deposition technique in MWPACVD (Microwave Chemical Wapour Deposition) system (2,45 GHz, 350 W). During the treatment gaseous mixtures containing CH4 and N2 were introduced to the reactor under low pressure (0,2 and 0,7 Tr) at low temperature of 400oC. The steel surface structure was analysed by X-ray photoelectron spectroscopy (XPS). The corrosion behaviour of the samples was determined basing on polarisation (LSV) curves measured in an aqueous solution of sodium chloride (3% NaCl). The surfaces modifi ed by carbonitriding showed a better ability to passivation compared to the unmodifi ed ones.

Results of fi eld and laboratory investigations of organic linings have been presented. The linings are used to corrosion protection of inner part of fl ue gas desulphurization units in clean gas moisture area condensation. Two vinylester coatings have been investigated. The coatings had different fi ller, one of them was in the form of fl akes while the other one was in the spherical shape. Differences in corrosion resistance of investigated coatings have been found.

This work presents the results of investigations concerning an assessement of corrosion resistance of the Ni-W coatings electrodeposited on a carbon steel substrate using galvanostatic method, before and after heat treatment in air at temp. 900°C. Resistance to electrochemical corrosion was tested in 5% NaCl solution using potentiodynamic polarization technique and electrochemical impedance spectroscopy. The coatings were also subjected to a qualitative assessement in tests of resistance to neutral salt fog effect according to PN-EN ISO 9227:2007 standard. Characteristics of the material under investigation before and after corrosive tests was carried out using scanning electron micrsocopy and X-ray diffraction. Suggested reason for the improvement of protective properties of the Ni-W coating after heat treatment is the modifi cation of its structure.

Electrolytic of Zn-Ni-P-W alloy coatings were obtained on the St3S carbon steel substrate, at the galvanostatic conditions, using a cathodic current density j = 20 mA·cm-2. These coatings were subjected to thermal treatment in argon atmosphere. The study examined the infl uence of thermal treatment on the surface morphology, phase composition and corrosion resistance of obtained coatings. Surface morphology and surface chemical composition were studied using a scanning electron microscopy. Structural studies were made using X-ray diffraction method. Electrochemical corrosion resistance tests were carried out in 5% NaCl solution. Based on these studies it was found that thermal treatment improves the values of parameters of corrosion resistance. The value of polarization resistance increases, the value of the corrosion current decreases and value of the corrosion potential shift towards positive values. This suggests a positive effect of thermal treatment of Zn-Ni-P-W coatings on their corrosion resistance.

Magnesium, AZ91 alloy and composite materials AZ91/SiC undergo active dissolution in Ringer solution at 36,70C. The corrosion resistance of AZ91 magnesium alloy is determined by β-Mg17(Al, Zn)12 phase. This phase easily undergoes the passivation, hence hinder the corrosion process of AZ91 alloy. However, the presence of SiC in composite AZ91/SiC does not have essential infl uence on its corrosion resistance in Ringer solution compare to corrosion resistance of AZ91 magnesium alloy.