Formation of Surface Corrosion-Resistant Nanocrystalline Structures on Steel

Abstract

Engineering materials with nanocrystalline structure could be exploited under simultaneous action of mechanical loading and corrosion environments; therefore, their corrosion resistance is important. Surface nanocrystalline structure was generated on middle carbon steels by severe plastic deformation using the method of mechanical pulse friction treatment. This treatment additionally includes high temperature phase transformation and alloying. Using a complex of the corrosive, electrochemical and physical investigations, it was established that nanocrystalline structures can be characterized by lower or increased corrosion resistance in comparison with the reference material. It is caused by the action of two confronting factors: arising energy level and anticorrosive alloying of the surface layer.

An Overview on the Corrosion Behavior of Steels Processed by Severe Plastic Deformation

“…Medium carbon steels, such as 45 and 35 steels subjected to surface mechanical pulse friction treatment (MPT) have shown a more complex behavior, because this treatment, which combines SPD and surface alloying, can both increase or decrease the corrosion rate. The authors showed that steel 45 with a higher content of carbon processed using MPT undergoes corrosion more intensively than the steel 35 (79) , which corresponds to the general rule that an increase in the carbon content of steel increases the corrosion rate (80,81) . However, the MPT process in the 45 steel increases the quantity of retained austenite which can influence the corrosion processes of the metal too.…”

Перспективність Використання Нанотехнологій Для Підвищення Працездатності Сільськогосподарської Техніки

“…У Фізико-механічному інституті НАН України розроблено технологію механоімпульсної обробки, яка формує НКС на високонавантажених поверхнях деталей машин. Автори (Kyryliv, 2012;Kyryliv et al, 2015;Nykyforchyn et al, 2016) показали підвищення експлуатаційних властивостей деталей за зношування, контактних навантажень, дії агресивних середовищ.…”

Fatigue and Corrosion Fatigue of the Roll Steels with Surface Nanostructure

“…Presence of considerable amount of interfaces and higher content of alloying elements in the surface layer reduce the negative influence of hydrogen on material [7]. Besides, surface NCS effects on wetting angles of the surface and weakens its interaction with aggressive medium [8].…”