- Title
- Investigation the effect of porosity on corrosion resistance and hardness of wc-co coatings on metal substrates
- Creator
- Oladijo, O.P., Obadele, B.A., Venter, A.M., Cornish, L.A.
- Subject
- Porosity, HVOF, Thermal spray
- Date
- 2016
- Type
- Article
- Identifier
- http://hdl.handle.net/10210/215160
- Identifier
- uj:21371
- Identifier
- Citation: Oladijo, O.P. et al. 2016. Investigation the effect of porosity on corrosion resistance and hardness of wc-co coatings on metal substrates.
- Description
- Abstract: Porosity is an important coating feature which strongly influences coating properties. Porosity creates poor coating cohesion and allows for higher corrosion rate and wear, and is generally associated with a higher number of unmelted or solidified particle that become trapped in the coating [1]. This investigation was conducted to investigate the effect of porosity on the hardness and corrosion resistance of WC-17Co coating on metal substrates. Coating of about 200μm were successful deposited by HVOF techniques unto four metal substrates, namely brass, 304L stainless steel, super-invar and aluminium. The corrosion behaviour was examined in chloride medium using direct current (DC) polarization test. The Vickers hardness was undertaken at loads of 5 kg for 10 s. The microstructures of the coatings were studied before and after the corrosion tests by scanning electron microscopy with EDX. The results indicated a strong correlation between porosity and corrosion rate, as well as hardness of the WC-17Co coatings.
- Language
- English
- Rights
- ©2016, authors
- Full Text
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