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Structure of Metal Oxide Multilayers Deposited by Sol-Gel Method on Surface of NiTi Shape Memory Alloy

100%

Osak P., Waś J., Łosiewicz B.

Acta Physica Polonica A

2016

vol. 130

issue 4

1069-1071

The metal oxide layers were deposited onto the surface of NiTi shape memory alloy using sol-gel method. Single-, double- and triple-layers were obtained from a colloidal solution containing the precursor of zirconium tetrabutoxide and titanium tetrabutoxide, and annealed at 300°C for 1 h in argon. Phase composition was determined by grazing incidence X-ray diffraction. Surface roughness of the metal oxide layers were determined by atomic force microscopy. Surface morphology and thickness of the obtained layers were studied by scanning electron microscopy. It was found that all obtained layers revealed a composite structure, and were characterized by low surface roughness and thickness parameters. A homogeneous structure of the metal oxide layers deposited onto the surface of the medical NiTi alloy was ascertained only for double- and triple-layers.

Structure and Corrosion Resistance of Nickel-Molybdenum Alloy Coatings

88%

Popczyk M., Zacharz M., Osak P., Dercz G., Łosiewicz B.

Acta Physica Polonica A

2016

vol. 130

issue 4

1072-1074

Electrolytic Ni-Mo alloy coatings were obtained from the galvanic bath, at the temperature of T= 60°C under galvanostatic conditions using a cathodic current density of j= 80 mA cm¯². Surface morphology was studied using a scanning electron microscopy. Chemical composition of obtained coatings was determined by the energy dispersive spectroscopy. Structural studies were carried out using an X-ray diffraction method. Electrochemical corrosion resistance tests were carried out in 5% NaCl solution. It was found that X-ray diffraction investigations of all obtained coatings showed the characteristic "halo", which suggests that the obtained deposits have an amorphous structure. Chemical composition and corrosion resistance of the electrolytic Ni-Mo coatings depend on the concentration of Na₂MoO₄· 2H₂O in a galvanic bath. With the increase of the molybdenum content in the alloy coatings, their corrosion resistance increases.

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2 Acta Physica Polonica A

2 2016

2 Osak P.

2 Łosiewicz B.

1 Dercz G.

1 Popczyk M.

1 Waś J.

1 Zacharz M.

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Structure of Metal Oxide Multilayers Deposited by Sol-Gel Method on Surface of NiTi Shape Memory Alloy

Structure and Corrosion Resistance of Nickel-Molybdenum Alloy Coatings