Nodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m−2 day−1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.
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The paper presents results of research aimed at determining the corrosive properties of steel with cathode metal coating in selected corrosive environments. The corrosion properties of the tin coated steel were evaluated using electrochemical impedance spectroscopy and potentiodynamic tests. For realised measurements, distilled water, 0.5 mol dm−3 NaCl solution, 0.1 mol dm−3 NaCl solution and SARS, which simulates acid rain were used as corrosive solutions. Both corrosion methods are suitable for diagnosing corrosion properties of steel with metal coatings.
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were on high sodium (8% NaClsolution) diet for 4 weeks (period of induction hypertension), and this animals did not drink tap water during the experimental protocol. BP was monitored before (initial values), after period of induction hypertension (confirmation of hypertension) and after the training period (assessment of the impact of swimming on hypertension). Swimming training protocol Rats swam in a specially constructed swimming pool made of glass (80×60×100 cm) in which water temperature (37 ± 1 °C) was maintained by an electric heater, and a pump continuously
A trend of applying composite reinforcement in construction industry has been growing in Russia recently: hence, new manufacturing plants have appeared and the volume of sales has increased. However there were not enough experimental studies of the polymer reinforcement chemical stability and the influence of various factors (climate, corrosive environments, nonstationary loading, etc.) on the strength of structures reinforced with polymer rebars. The objective of this investigation was to identify the influence of long-term storage conditions and exposure to corrosive environment (i.e. 5 % NaCl solution) produced on the mechanical properties of GFRP rebars.
In this work, Zn-Ni alloys have been deposited on steel from sulfate bath, by electrodeposition method. The effect of Zn content on deposits properties was studied by cyclic voltammetry (CV), chronoaperometry (CA), linear stripping voltammetry (ALSV) and diffraction (XRD) and scanning electronic microscopy (SEM). The corrosion behavior in 3.5 wt. NaCl solution was examined using anodic polarization test and electrochemical impedance spectroscopy. X-ray diffraction of show that Zn-Ni alloys structure is composed of δ phase and γ phase, which increase with the decrease of Zn content in deposits. Results show that deposits obtained from bath less Zn2+ concentration exhibited better corrosion resistance.