Hot corrosion behaviour of different Cr₃C₂–NiCr coatings on boiler tube steel at elevated temperature

Abstract

Purpose This paper aims to investigate hot corrosion behaviour of different Cr3C2–NiCr coatings on boiler tube steel. Design/methodology/approach High velocity oxy fuel technique has been used to deposit different coatings on commercially available ASTM-SA213-T22 boiler tube steel. The hot corrosion studies have been performed in molten salt environment at 900°C temperature in silicon tube furnace in laboratory. Findings The results showed that uncoated superalloy suffered intense spalling and the weight change was massive during each cycle on studies of hot corrosion 900°C. The 100 per cent NiCr and 10 per cent (Cr3C2) – 90 per cent (NiCr) coatings provided better protection to T22 steel against the hot corrosion because of the formation of Ni and Cr3C2 layers. Originality/value In this research a variety of coatings have been used. This research work has been aimed to investigate the hot corrosion behavior of Boiler Steel b with different Cr3C2–NiCr coatings, under molten salt environment in Silicon tube furnace at 900°C, under cyclic conditions.

Development and application of thermal calculation software for boiler furnace

“…Based on the aforementioned calculation principles, this paper has compiled a supercritical boiler furnace thermal calculation software [5]. This software needs the support of the Microsoft Visual Basic 6.0 language environment.…”

“…Supercritical boilers have large volume and high working fluid parameters in the tubes, and they are generally once-through boilers. The main differences between supercritical boilers and small-capacity boilers in furnace structure size and heat transfer characteristics are: on the one hand, after the working fluid parameters reach supercritical, the superheated heat absorption share increases, in order to ensure that the flue gas temperature at the furnace outlet does not exceed the slagging of coal temperature, more radiant superheaters need to be arranged in the furnace [2]. On the other hand, the furnace adopts a spiral coil design, which makes the mass-flow rate in the water wall tube higher under various loads, and the water wall uses an internally threaded tube, which has a higher heat transfer coefficient in the tube.…”

The Effects of Laser Cladding Surface Treatment on Surface Degradation Properties :a Review

“…Higher weight loss has been experienced in boiler uncoated steel at higher temperatures (30). Coating surface modification is fast developing the technology because we can get different material properties from single materials as per industry requirements (31). At extraordinary temperatures Cr 3 C 2 -NiCr has shown higher erosion and corrosion resistance (32).…”

Hot-corrosion behaviour of CNT reinforced Cr3C2-NiCr coatings working under high-temperature sprayed by HVOF method

“…45 Singh et al reported that NiCr coatings exhibited better corrosion resistance than the substrate. 46 Goyal et al reported the hot-corrosion performance of Al 3 O 3 /MWCNTs coatings sprayed using the plasma spray technique. They concluded that there was a 70% reduction in the corrosion rate of the Al 2 O 3 /MWCNT coating as compared to the Al 2 O 3 coating.…”