Hydrophobic durability and anti-corrosion of plasma nitriding layer: Evolution mechanisms of corrosion behavior under variations in local hydrochemistry

Abstract Mechanisms for the effects of nitrogen on durability hydrophobic and corrosion resistance modified layers prepared surface AH32 steel by plasma nitriding have been investigated. It was found that can significantly improve hydrophobicity steel. All contact angles (CAs) with 1 h, 3 h 5 were higher than 120°, which had excellent hydrophobicity. The acidification degree solution within layer’s micro-zone effectively reduced due to dissolution nitrogen. micro-nano structures corroded severely after 15 days exposure NaCl solution. When time is extended intensified enhanced blocking effect, in layer saturated cannot provide enough ions offset solution, so decreased instead. In comparison, this study best long-term service protective effect