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Effect of spray distance on the microstructure and corrosion resistance of WC - based coatings sprayed by HVOF

Jonda Ewa, Łatka Leszek, Maciej Artur, Godzierz Marcin, Gołombek Klaudiusz, Radziszewski Andrzej

Bulletin of the Polish Academy of Sciences. Technical Sciences

2023

Vol. 71, nr 2

art. no. e144610

Cermet coatings provide protection against aggressive operating environment of machine and device elements, such as corrosion, wear or high-temperature conditions. Currently WC-based cermet coatings are frequently used in the different industry branches. In this work, conventional WC-based powders (WC-Co and WC-Co-Cr) were sprayed with High Velocity Oxy Fuel (HVOF) onto AZ31 magnesium alloy with different spray distances (320 and 400 mm). The aim of the research was to investigate the effect of the spray distance on the microstructure of the coatings, phase composition and electrochemical corrosion resistance. Results revealed that higher spray distance results in greater porosity, 1.9% and 2.3% for 320 mm and 2.8% and 3.1% for 400 mm in case of WC-Co and WC-Co-Cr coatings, respectively. Also the influence has been observed for coatings microhardness, c.a. 1300 HV0.3 for shorter spray distance, whereas for longer one it was less than 1100 HV0.3. The corrosion resistance estimated in potentiodynamic polarization measurements was the best for WC-Co-Cr coating deposited from the shorter spray distance, corrosion current density was equal to 2.9 µA·cm-2 and polarization resistance was equal to 8424 Ω∙cm2.

Naddźwiękowe natryskiwanie cieplne HVOF powłok o wysokiej odporności korozyjnej

Formanek B., Szymański K.

Inżynieria Materiałowa

2003

R. XXIV, nr 6

472-475

Przedstawiono zagadnienie technologii wytwarzania powłok stanowiących alternatywę dla twardego chromu. Przedstawiono zalety i wady procesów, stosowane materiały powłokowe oraz wybrane urządzenia i parametry technologiczne procesu natryskiwania cieplnego oraz charakterystykę wytworzonych powłok. Alternatywne powłoki o wysokiej odporności korozyjnej i odporności na ścieranie wytwarzano przez natryskiwanie HVOF proszków WC-Co-Cr, WC-Cr3C2- NiCoCr, NiCr -Cr3C2. Proszki z węglikami chromu otrzymywano w procesach syntezy wysokotemperaturowej.

The problem of the technology of producing coatings which constitute an alternative to hard chromium is presented in the paper. Both advantages and disadvantages of the processes are presented as well as the coating materials applied, selected equipment and technological parameters of the thermal spray process and characteristics of the coatings produced. The alternative coatings of high corrosion and abrasion resistance were produced by HVOF spraying of WC-Co-Cr, WC-Cr3C2- NiCoCr and NiCr-Cr3C2 powders. Powders with chromium carbides were obtained by high-temperature synthesis.