from the conferences organized by TANGER Ltd. provisional website
Carbide coatings prepared using the HP/HVOF technology are widespread and commonly used surface treatment. These coatings provide various advantages compared with the substrate material and are able to supply top mechanical and corrosion properties at a low cost. On the other hand, the removing of carbide coating is a big problem. It is not important if the removal is necessary for the renovation of the part or if there was a production error and there is no other way of repair than a complete removal of the coating from the substrate. The problem is that these coatings have the highest hardness (around 90 HRC), which reduces the number of possible ways of removal. More precisely, there is only one method suitable for this operation and it is grinding (time consuming, expensive and with limited geometry of use…). This paper is focused on the use of electrochemical removal of carbide coatings, which can fully replace the grinding. The benefits are a low cost and the possibility of removing the coating from a shaped surface. Results in this paper show the removal of the CrC-NiCr coating prepared by means of HP/HVOF (JP-5000). The main aim was to evaluate the efficiency of this process, which is assessed as a weight loss of the coating after predetermined time. The final surface was evaluated using the optical microscopy with the focus on the mechanism of removal and the quality of the substrate material.Keywords: HVOF, coating, CrC-NiCr, carbide coating, electrochemical coating removal
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