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eng Corrosion investigations of Al-Si casting alloys in 0.6 M NaCl solution
Smokvina Hanza, Sunčana; Vrsalović, Ladislav; Štic, Lovro; Liverić, Lovro
Engineering Review Vol. 41, No. 3, 2021
This paper presents results of the corrosion investigations of specimens made from finished parts for the automotive industry, produced by high-pressure die casting and gravity die casting process of six Al-Si alloys (40000 series). Open circuit potential and potentiodynamic polarization measurements have been performed using a potentiostat with three-electrode set-up in 0.6 M NaCl naturally aerated solution. Microstructural characterization before and after electrochemical investigations has been carried out with optical microscope to establis...
Hrčak ID: 251349


eng Electrochemical Characterization of Bronze Exposed to Outdoor Atmosphere
Otmačić Ćurković, H.; Mikić, D.; Bera, L.; Kovačević, E.; Marcelja, M.
The aim of this work was to examine corrosion behaviour of bare and artificial patinated bronzes during exposure to urban outdoor atmosphere. Studies were conducted on copper and two different bronzes in order to evaluate the influence of substrate composition on patina composition and electrochemical behaviour. Additionally, two different patination methods were compared. Corrosion behaviour was examined using electrochemical impedance spectroscopy with gel-electrolyte electrochemical cell. The composition of patina was determined by ATR-FTIR...
Hrčak ID: 261164


eng Effect of <i>Helichrysum italicum</i> on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution
Pilić, Zora; Martinović, Ivana; Pavlinović, Marija; Zlatić, Gloria
Croatica Chemica Acta Vol. 92, No. 1, 2019
The aqueous extract of the Helichrysum italicum leaves (HI) is tested as a corrosion inhibitor of an iron in a simulated acid rain using potentiodynamic polarisation, cyclic voltammetry and electrochemical impedance spectroscopy. Results of all electrochemical methods indicate an increase of a corrosion inhibition efficiency of the iron with the HI extract concentration. Maximum inhibition efficiency (~ 50 %) is obtained at 2.0 g L–1 HI extract. The inhibitive action is assumed to occur via an adsorption of the HI extract on the iron surface. R...
Hrčak ID: 221403


eng Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution
Martinović, Ivana; Pilić, Zora; Zlatić, Gloria; Barišić, Marija; Čelan, Stipe
Croatica Chemica Acta Vol. 94, No. 2, 2021
Extract of <i>Alchemilla vulgaris</i> L. was investigated as eco-friendly corrosion inhibitor for aluminium in 3 % NaCl using electrochemical techniques. According to the results, inhibition efficiency increases with the increase concentration of extract and the highest efficiency (~80 %) is recorded for the maximal concentration of extract (1.0 g L–1). The inhibition activity of extract occurs by the spontaneous physisorption (ΔG ≈ –16 kJ mol–1) on active sites of aluminium surface that follows Freundlich isotherm. Polarization curves showed t...
Hrčak ID: 272525


eng Treatment of oily wastewater by electrocoagulation technology: A general review (2018-2022)
Jasim, Muhammad Aiyd; AlJaberi, Forat Yasir AlJaberi
A huge amount of oily wastewater is discharged annually from several industries like petroleum and petrochemical factories. Scientists and researchers are permanently concentrated on creating conventional technologies or identifying novel treatment options for oily wastewaters, since they need to be treated before being discharged into the soil and aquatic ecosystems. Electroc­oagu­lation technology (ECT) is an electrochemical method employed to remove numerous pollutants from domestic and industrial wastewaters. This paper aims to review the r...
Hrčak ID: 294865


eng The influence of chloride ion concentration on the corrosion behavior of the CuAlNi alloy
Vrsalović, Ladislav; Ivanić, Ivana; Čudina, Diana; Lokas, Lea; Kožuh, Stjepan; Gojić, Mirko
Tehnički glasnik Vol. 11, No. 3, 2017
The influence of different chloride ion concentration (0.1 %, 0.5 %, 0.9 % and 1.5 % NaCl solution) on the electrochemical behaviour of the cast CuAlNi alloy was examined with electrochemical techniques (open circuit potential measurements, linear and potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS)). After polarization measurements, electrode surfaces were examined with an optical microscope and the SEM/EDS analysis. Polarization measurements revealed that an increase in chloride ion concentration lead...
Hrčak ID: 186647


eng The Influence of Microstructure on Hydrogen Diffusion and Embrittlement of Multiphase Fine-Grained Steels with Increased Plasticity and Strength
Begić Hadžipašić, A.; Malina, J.; Malina, M.
The influence of microstructure on hydrogen diffusion and embrittlement of multiphase fine-grained structural steels with increased plasticity and strength was studied with electrochemical experiments which provide the hydrogenation of specimens in conditions simulating practice requirements. By means of all experimental data obtained from permeation experiments, mechanical investigations, SEM and EDS analyses, TRIP steel has shown greater resistance to hydrogen embrittlement than DP steel, testified by lower index of hydrogen embrittlement, l...
Hrčak ID: 69844


hrv Primjena elektrokemijske metode u analizi polisaharida u morskoj vodi
eng Applying electrochemical method in the analysis of polysaccharides in seawater
Plavšić, Marta; Strmečki Kos, Slađana
Hrvatske vode Vol. 27, No. 109, 2019
U ovom je radu opisana primjena brze i osjetljive elektrokemijske metode kronopotenciometrije s konstantnom pobudnom strujom (CPS) koja se do sada nije primjenjivala za analizu prirodnih voda i koja je omogućila detekciju polisaharida (PS) u morskoj vodi mjerenjem katalitičkog vala vodika. Elektroanaliza PS u moru bila je ograničena, jer su PS elektroinaktivne molekule. CPS metoda elektroanalize omogućuje određivanje i drugih polimernih organskih spojeva koji imaju katalitički aktivne grupe, a koje omogućuju razvijanje katalitičkog vala vodika...
Hrčak ID: 226672


hrv Istraživanje utjecaja inhibitora na koroziju ugljičnog čelika u vodi s biocidom
eng Investigation of Effects of Inhibitor on Corrosion of Carbon Steel in Water with Biocide
Smoljko, Ivana; Vrsalović, Ladislav; Gudić, Senka; Đaković, Klara
Kemija u industriji Vol. 69, No. 9-10 (special issue), 2020
U ovom radu istražen je utjecaj komercijalnog inhibitora (Chemtec FI30) na proces korozije ugljičnog čelika P235 u različitim vodenim otopinama; demineraliziranoj i/ili vodovodnoj vodi uz dodatak komercijalnog biocida (Chemtec BI01). Istraživanja su provedena gravimetrijskom metodom i elektrokemijskim metodama, dok je površina ispitivanog materijala analizirana pomoću optičkog mikroskopa. Analize pokazuju da inhibitor smanjuje brzinu korozije ugljičnog čelika u ispitivanim otopinama, ima visoku djelotvornost te da se može svrstati u anodne inhi...
Hrčak ID: 243906


hrv OTPORNOST NA KOROZIJU I TROŠENJE MODIFICIRANIH POVRŠINA MARTENZITNIH KOROZIJSKI POSTOJANIH ČELIKA
eng RESISTANCE ON CORROSION AND WEAR OF MARTENSITIC STAINLESS STEELS MODIFIED SURFACES
ger VERSCHLIESSFESTIGKEIT DER MARTENSITISCHEN NICHTROSTENDEN STÄHLE MIT OBERFLÄCHENMODIFIKATION FÜR BESSERE KORROSIONS- UND VERSCHLEISSEIGENSCHAFTEN
Rozing, Goran; Marušić, Vlatko; Nedić, Bogdan
Zavarivanje Vol. 59, No. 5-6, 2016
Na uzorcima korozijski postojanih čelika provedena su laboratorijska ispitivanja te ispitivanja u stvarnim uvjetima trošenja. Elektrokemijska ispitivanja provedena su radi provjere korozijske otpornosti modifi ciranih površina čelika. Na uzorcima korozijski postojanih čelika X20Cr13 i X17CrNi16-2 provedena je metalografska analiza i ispitivanje tvrdoće. Mogućnost primjene modifi ciranih površina na odabranim čelicima provjerena je ispitivanjem uzoraka svornjaka u stvarnim uvjetima trošenja. Uzorci svornjaka zavareni su REL postupkom, a koriš...
Hrčak ID: 173167