Authors: M AghaieKhafri M Mohamadpour Nazar Abady
Publish Date: 2012/06/07
Volume: 64, Issue: 6, Pages: 694-701
Abstract
In the current study the microhardness layer depth corrosion properties and kinetics of chromium boride coatings on DIN 12714 hotworked tool steel have been investigated Thermodiffusion chromium boride coatings have been carried out for the first time by a duplex salt bath immersion coating by chromizing at 1050°C followed by boronizing at 950°C 1000°C and 1050°C chromoboronizing The coating layer obtained was hard 2482 HV compact and homogeneous The kinetics of the chromium boride coating followed a parabolic relation d 2 = Kt and the activation energy of the formation of the chromoboronized layer was calculated as 132 kJ/mol The corrosion resistance of the coating was evaluated by potentiodynamic polarization in 35 NaCl solution The results showed the degradation of the corrosion properties of the coated samples
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