Abstract
Single thin coating of matt nickel (Nimat), a mirror bright copper (Cubright), a mirror bright nickel (Nibright) and their combinations were electrochemically deposited on brass substrate with thickness 500 μm. The basic aim was electrodeposition of two-layer Cubright/Nimat and Nibright/Cubright systems, and three-layer Nibright Cubrigh/Nimat system, which are among the most widely applied protective and decorative systems in light and medium operating conditions of corrosion. The thicknesses of the obtained films varied from 1 μm to 3.25 μm. They were investigated via nanoindentation experiments, in order to characterize their basic physical and mechanical characteristics, related with their good adhesion and corrosion protective ability, as well as ensuring the integrity of the system “protective coating/substrate” to possible mechanical, dynamic and/or thermal stresses. As a result, load-displacement curves were obtained and indentation hardness and indentation modulus were calculated using the Oliver & Pharr approximation method. The dependence of the indentation modulus and the indentation hardness on the depth of the indentation, surface morphology and structure of the obtained coatings, their texture and surface roughness were investigated too. The obtained results showed that the three-layer Nibright/Cubright /Niimat/CuZn37 system has highest indentation modulus and indentation hardness, following by two-layer Nibright/Cubright system and single layer coatings.
Highlights
It is considered that among the most reliable protective and decorative coatings of metal details are electrodeposited coatings of copper, nickel and chromium [1], which can be combined into different double or triple systems
Single thin coating of matt nickel (Nimat), a mirror bright copper (Cubright), a mirror bright nickel (Nibright) and their combinations were electrochemically deposited on brass substrate with thickness 500 μm
The thicknesses of the obtained films varied from 1 μm to 3.25 μm. They were investigated via nanoindentation experiments, in order to characterize their basic physical and mechanical characteristics, related with their good adhesion and corrosion protective ability, as well as ensuring the integrity of the system "protective coating/substrate” to possible mechanical, dynamic and/or thermal stresses
Summary
It is considered that among the most reliable protective and decorative coatings of metal details (made of different types of steel or zinc, copper and aluminium alloys, which are exploited under different corrosion conditions) are electrodeposited coatings of copper, nickel and chromium [1], which can be combined into different double or triple systems. It is important to have data about their properties, because in the case of electrochemically deposited protective metal layers, depending on the composition of working electrolytes and regimes in which are obtained, they differ too strongly from the physico-mechanical properties of metallurgically obtained metals (for which reference data are usually published) In this connection the aim of present work was determination of indentation hardness (HIT) and indentation modulus (ЕIT) of single-layer thin films of mat nickel (Nimat), mirror bright copper (Cubright), mirror bright nickel (Nibright), as well as their combinations, designed to obtain the Cubright/ Nimat and Nibright/Cubright double layer systems and the Nibright/Cubright/ Nimat three-layer systems, electrochemically deposited on brass substrates (CuZn37), which are among the most widely used protective/decorative metal coatings/systems in light and medium operating/corrosion conditions
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