Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 110, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2022.106019
Keywords
Hardmetals; Alternative binders; Oil and gas; Corrosion behaviour; Acid environment; Hydrofluoric acid
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This study investigates the corrosion behavior of cemented carbides with different Ni-based binders in highly corrosive environments. The results show that the hardmetals with Ni-based binders exhibit superior corrosion resistance compared to WC-Co.
Highly corrosive agents, such as saltwater, hydrogen sulphide, hydrofluoric or hydrochloric acids, are frequently found in oil and gas exploration. The high costs associated with the premature replacement of equipment damaged by corrosion and the consequent production losses justify the search for more resistant materials. In this work, the corrosion behaviour of cemented carbides with different Ni-based binders in highly corrosive envi-ronments (HCl and HF) was studied by electrochemical techniques (EIS, OCP and polarization curves). HF was slightly more aggressive than HCl and far more corrosive than near neutral NaCl solution. The hardmetals with Ni-based binders presented a corrosion resistance superior to WC-Co in all environments.
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