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Pavlína ŠOMANOVÁ

Brno University of Technology

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Leoš Doskočil

Brno University of Technology

Martin Buchtík

Brno University of Technology

Jaromír Wasserbauer

Brno University of Technology

Matěj Březina

Brno University of Technology

Daniel Kajánek

University of Žilina

Eliška KOBZINKOVÁ

Brno University of Technology

Tomáš Horäk

Research Institute of Brewing and Malting (Czechia)

Cooperative Institutions

Brno University of Technology

Centre National de la Recherche Scientifique

University of Žilina

University of Chemistry and Technology, Prague

Université de Poitiers

Institut de Chimie des Milieux et des Matériaux de Poitiers

Czech Academy of Sciences, Institute of Physics of Materials

TU Wien

Politecnico di Milano

Research Institute of Brewing and Malting (Czechia)

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The importance of current mode on the properties of PEO coatings deposited on the surface of powder metallurgy-produced Mg substrate

Metal ... (2024)

Martin Buchtík Pavlína ŠOMANOVÁ Eliška KOBZINKOVÁ Matěj Březina Leoš Doskočil

Powder Metallurgy

Mode (computer interface)

10.37904/metal.2024.4945

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Influence of humic acid on corrosion of low carbon steel in neutral aqueous solution containing chlorides

Metal ... (2022)

Leoš Doskočil Pavlína ŠOMANOVÁ Martin Buchtík Tomáš Horäk Jaromír Wasserbauer

The effect of lignitic humic acid in 0.1 M NaCl at pH 7 on low carbon steel was investigated using potentiodynamic polarization and immersion test.The morphology and elemental composition of the corrosion products were characterized using scanning electron microscopy with energy dispersive spectroscopy.The results showed that humic acid accelerated the corrosion of low carbon steel in 0.1 M NaCl.The negative effect of humic acid was attributed to the complexation of the molecules with iron ions.After seven days, immersion tests revealed that steel in 0.1 M NaCl was covered with the discontinuous black corrosion products, whereas humic acid in 0,1 M NaCl induced the formation of a continuous layer of brown corrosion products with low adhesion to the surface.The elemental composition of the black and brown corrosion products corresponded to Fe3O4 and FeOOH, respectively.

Carbon steel

Carbon fibers

10.37904/metal.2022.4486

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Preparation of PEO coatings on AZ31 magnesium alloy in the presence of humic acid

Metal ... (2023)

Leoš Doskočil Pavlína ŠOMANOVÁ Jaromír Wasserbauer Daniel Kajánek Martin Buchtík

Magnesium materials are desirable for surface treatment because of their low corrosion resistance.The preparation of coatings on AZ31 alloy by plasma electrolytic oxidation (PEO) in a bath with and without humic acid was investigated.The coatings were characterized using a scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR).The corrosion properties were tested using the potentiodynamic polarization method in 0.15 M NaCl.The results show that the PEO coatings had significantly higher corrosion resistance than the AZ31 alloy.The PEO coating prepared in the presence of 5 mg/l humic acid (10 min deposition) appeared to have slightly better corrosion resistance than the PEO coating prepared in the absence of humic acid.

Plasma electrolytic oxidation

10.37904/metal.2023.4713

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Corrosion behaviour of AZ31 magnesium alloy in saline containing glucose at different concentrations

Metal ... (2022)

Leoš Doskočil Pavlína ŠOMANOVÁ Jaromír Wasserbauer

AZ31 magnesium alloy was subjected to corrosion tests in a 0.9% NaCl containing 0 to 5 g/L D-glucose at 37°C.Potentiodynamic measurements were performed in corrosive environments with natural pH and with the pH set to 7.4.The results show that glucose in the range of 0.1 to 5 g/L led to a deterioration of the corrosion resistance of AZ31 alloy in 0.9% NaCl at an initial pH of 7.4.If the corrosive environment did not have a set pH, then a slightly different behavior was observed.Addition of 0.1 g/L glucose to 0.9% NaCl resulted in inhibition of corrosion, while higher concentrations accelerated corrosion.The corrosion aggravation was related to the oxidation of glucose to gluconic acid, which together with chlorides degraded the Mg(OH)2 layer on the AZ31 alloy surface.Surface analysis revealed that the corroded AZ31 alloy was covered with fine crystals in the absence of glucose.

Gluconic acid

10.37904/metal.2022.4487

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Preparation of Mg-Al LDH coating on AZ31 magnesium alloy under mild conditions

Metal ... (2023)

Pavlína ŠOMANOVÁ Martin Buchtík Jaromír Wasserbauer Leoš Doskočil

Magnesium and its alloys are interesting materials but they have low corrosion resistance.Magnesiumaluminium double layered hydroxide (Mg-Al LDH) coatings were prepared on AZ31 alloy by hydrothermal method at 50 °C, 70 °C and 90 °C at different reaction times (3 h, 6 h and 24 h).The coatings were characterized by scanning electron microscope (SEM) with energy dispersive X-ray spectroscope (EDS), Xray diffraction (XRD) and potentiodynamic polarization measurements in 0.15 M NaCl.The optimum conditions for the preparation of the coating included a temperature of 90 °C and a reaction time of 24 h, as the coating was composed of Mg-Al LDH and exhibited the highest corrosion resistance.

10.37904/metal.2023.4712

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