This paper presents results of the corrosion investigations of specimens made from finished parts... more 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 setup in 0.6 M NaCl naturally aerated solution. Microstructural characterization before and after electrochemical investigations has been carried out with optical microscope to establish the connection between microstructure and corrosion parameters of investigated alloys and to analyze and record surface changes of each sample due to electrochemical corrosion. All alloys show good corrosion resistance, which manifests with low values of corrosion rates, calculated from the corrosion current densities obtained from potentiodynamic polarization measurements. Differences in electrochemical behavior appear due to the distinctions in their chemical composition and microstructure. The type of casting process does not affect electrochemical behavior of Al-Si alloys.
Low-alloy 42CrMo4 steel (AISI 4140) is a medium carbon steel, commonly used as a quenched and tem... more Low-alloy 42CrMo4 steel (AISI 4140) is a medium carbon steel, commonly used as a quenched and tempered steel. Because of its good mechanical properties, high tensile strength and toughness, 42CrMo4 is one of the widely used and investigated steels. To increase ductility even more, in addition to standard quenching and tempering, the steel is often hardened by double quenching and tempering and austempering. The aim of this paper was to investigate the corrosion behaviour of 42CrMo4 steel after quenching and tempering, double quenching and tempering and austempering. For this purpose, microstructural characterization and electrochemical investigation after different hardening processes were performed. The microstructure of the specimens was observed using optical microscopy and scanning electron microscopy. Open circuit potential and potentiodynamic polarization measurements of the tempered specimens were carried out using a computer-controlled potentiostat with a three-electrode set...
Jakov Bateli}1*, Vedrana [pada2, Lovro Liveri}3, Sanja Martinez4 1HEP Proizvodnja d.o.o. TE Plomi... more Jakov Bateli}1*, Vedrana [pada2, Lovro Liveri}3, Sanja Martinez4 1HEP Proizvodnja d.o.o. TE Plomin, Plomin luka 50, 52234 Plomin, Croatia 2 METRIS Materials Research Centre of Region of Istria, Zagreba~ka 30, 52100 Pula, Croatia 3University of Rijeka Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia 4University of Zagreb Faculty of Chemical Engineering and Technology, Maruli}ev trg 19, 10000 Zagreb, Croatia
In this paper, the corrosion behaviour of 42CrMo4 low-alloy steel after normalizing, soft anneali... more In this paper, the corrosion behaviour of 42CrMo4 low-alloy steel after normalizing, soft annealing, spheroidizing annealing and full annealing is investigated. 42CrMo4 is steel for quenching and tempering, and one of the widely used and studied steels due to its good combination of mechanical properties. Sometimes, it is used in the annealed condition. Nevertheless, the corrosion properties of 42CrMo4 steel are poorly studied, especially in the annealed condition. The main objective of this work is to increase the knowledge about the corrosion behaviour of the investigated alloy. The mechanical and microstructure properties of the samples after different annealing processes were characterised with hardness testing, optical and scanning electron microscopy (SEM) and X-ray diffraction (XRD). Measurements of the open-circuit potential and potentiodynamic polarisation of the samples after different annealing processes were carried out in a naturally aerated solution. It was found that ...
This paper presents results of the corrosion investigations of specimens made from finished parts... more 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 setup in 0.6 M NaCl naturally aerated solution. Microstructural characterization before and after electrochemical investigations has been carried out with optical microscope to establish the connection between microstructure and corrosion parameters of investigated alloys and to analyze and record surface changes of each sample due to electrochemical corrosion. All alloys show good corrosion resistance, which manifests with low values of corrosion rates, calculated from the corrosion current densities obtained from potentiodynamic polarization measurements. Differences in electrochemical behavior appear due to the distinctions in their chemical composition and microstructure. The type of casting process does not affect electrochemical behavior of Al-Si alloys.
Low-alloy 42CrMo4 steel (AISI 4140) is a medium carbon steel, commonly used as a quenched and tem... more Low-alloy 42CrMo4 steel (AISI 4140) is a medium carbon steel, commonly used as a quenched and tempered steel. Because of its good mechanical properties, high tensile strength and toughness, 42CrMo4 is one of the widely used and investigated steels. To increase ductility even more, in addition to standard quenching and tempering, the steel is often hardened by double quenching and tempering and austempering. The aim of this paper was to investigate the corrosion behaviour of 42CrMo4 steel after quenching and tempering, double quenching and tempering and austempering. For this purpose, microstructural characterization and electrochemical investigation after different hardening processes were performed. The microstructure of the specimens was observed using optical microscopy and scanning electron microscopy. Open circuit potential and potentiodynamic polarization measurements of the tempered specimens were carried out using a computer-controlled potentiostat with a three-electrode set...
Jakov Bateli}1*, Vedrana [pada2, Lovro Liveri}3, Sanja Martinez4 1HEP Proizvodnja d.o.o. TE Plomi... more Jakov Bateli}1*, Vedrana [pada2, Lovro Liveri}3, Sanja Martinez4 1HEP Proizvodnja d.o.o. TE Plomin, Plomin luka 50, 52234 Plomin, Croatia 2 METRIS Materials Research Centre of Region of Istria, Zagreba~ka 30, 52100 Pula, Croatia 3University of Rijeka Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia 4University of Zagreb Faculty of Chemical Engineering and Technology, Maruli}ev trg 19, 10000 Zagreb, Croatia
In this paper, the corrosion behaviour of 42CrMo4 low-alloy steel after normalizing, soft anneali... more In this paper, the corrosion behaviour of 42CrMo4 low-alloy steel after normalizing, soft annealing, spheroidizing annealing and full annealing is investigated. 42CrMo4 is steel for quenching and tempering, and one of the widely used and studied steels due to its good combination of mechanical properties. Sometimes, it is used in the annealed condition. Nevertheless, the corrosion properties of 42CrMo4 steel are poorly studied, especially in the annealed condition. The main objective of this work is to increase the knowledge about the corrosion behaviour of the investigated alloy. The mechanical and microstructure properties of the samples after different annealing processes were characterised with hardness testing, optical and scanning electron microscopy (SEM) and X-ray diffraction (XRD). Measurements of the open-circuit potential and potentiodynamic polarisation of the samples after different annealing processes were carried out in a naturally aerated solution. It was found that ...
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