Improved Oxidation and Hot Corrosion Resistance of 1Cr11Ni2W2MoV Stainless Steel at 650 °C by a Novel Glass-Ceramic Coating

A novel glass-ceramic coating was applied onto the 1Cr11Ni2W2MoV stainless steel. The oxidation and corrosion behaviors of coated and uncoated steels were comparatively investigated in air and in the presence of NaCl + Na2SO4 eutectic deposits at 650 °C, respectively. Protective scales formed on the surface of stainless steel prevented the severe oxidation of the alloy. Catastrophic hot corrosion occurred on the steel when a salt film was attached, producing loose iron oxide layers and internal corrosion zone. The glass-ceramic coating acted as a barrier that effectively hindered the invasion of corrosive species during the oxidation and hot corrosion tests.

INFLUENS OF NON-OXID ADDITIVS ON THE PROPERTIES OF GLASS-CERAMIC COATING FOR PARTS MADE OF HEAT-RESISTANT ALLOYS (review)

A review of the scientific and technical literature is presented, which provides examples of improving glass-based coatings by introducing non-oxide modifying additives. The main groups of chemical compounds that are used to improve the properties of glass-ceramic coatings are considered. Such substances include compounds based on boron, silicon and rare earth metals. It is concluded that these additives have a positive effect on the following properties of coatings: heat resistance, heat resistance, mechanical strength, coating formation temperature, temperature coefficient of linear expansion and adhesion strength to the protected material.