Thin Chromium-Based Coatings for Internal Combustion Automobile Engine Valve Protection
摘要
The chapter presents the latest findings concerning the impact of various liquid fuel types on the course of internal combustion engine valve high temperature corrosion, as well as a method to increase the heat-resistance of these elements by applying innovative chromium-based metallic coatings that are only a few micrometers thick. It also presents experimental results confirming the beneficial effect of adding nickel as an alloying element on the functionality of the thin chromium coatings along with an active element—yttrium. The latter significantly improves the heat-resistance of valve steels covered with the aforementioned protective coatings under thermal shock conditions. Finally, examples of potential application areas for chromium-based thin metal coatings outside the automotive industry are indicated.