Study of Ni-20Cr Coatings for High Temperature Applications – A Review

Abstract

Hot corrosion is a serious problem in various high temperature applications. The thermal spray coatings provides possible solution to counter the problem of hot corrosion in high temperature environment and enhances the life of equipment. Ni-20Cr alloy compositions require long initiation time at which the hot corrosion process moves from the initiation stage to the propagation stage. In this review, the performance of Ni-Cr coatings by different investigators has been presented to understand the mechanism of hot corrosion under different environments.Keywords: hot corrosion, nickel-chromium coatings, surface engineering, boilersWysokotemperaturowa korozja jest poważnym problemem w zastosowaniach wysokotemperaturowych. Możliwym rozwiązaniem problemu korozji w warunkach wysokiej temperatury poprzez zwiększenie żywotności urządzeń jest zastosowanie termicznych powłok natryskowych. Stopy o składzie Ni-20Cr wymagają długiego czasu inicjacji, po którym proces korozji wysokotemperaturowej z etapu inicjacji przechodzi do etapu propagacji. W tym przeglądzie zostały zaprezentowane badania zachowania powłok niklowo-chromowych wykonane przez różnych badaczy, żeby zrozumieć mechanizm korozji wysokotemperaturowej w warunkach różnych środowisk.

Suppression of molten salt corrosion by plasma sprayed Ni3Al coatings

“…4a). The uptake of O and Na by SS347 at an elevated temperature leads to the formation of FeO x and NaFeO x on the outer layers, both are known to form on the surface of stainless steel substrates after molten salt immersion [31,32,50]. The fact that O is found much deeper in the substrate than Na, which is found only on the surface, suggests that the absorption kinetic of O is much higher than that of Na.…”

Characterization and High-Temperature Oxidation Behavior of Ni–20Cr Deposits Fabricated by Cold Spray-Based Additive Manufacturing

“…Due to their promising high-temperature properties, Ni-20Cr alloys are frequently used for various applications in several industries such as automobile, aerospace, energy, nuclear, marine, and electronic industries [1][2][3][4]. Moreover, future applications of the alloys may include developing 3D standalone components for real-time industrial usage in energy and electricity (bolts, blades, shafts, discs, exhaust gas reheaters, rings of gas, and steam turbines); nuclear (catheters, control levers, stem); automotive (exhaust valves, engine fasteners, liners, piston rings); metal processing (heating tools, molds); national defense and aerospace (shafts, blades, afterburners, barrels, thrust reversers for jet turbine engines); electronics (electronic components, vacuum tube components) [5]. Products of Ni-20Cr materials are generally manufactured using various conventional methods such as conventional powder metallurgy, liquid metallurgy, casting, forging, and machining [6].…”

Anti-corrosion properties of NiCr amorphous coatings sprayed by magnetron sputtering

“…NiCr alloy coatings have a low-temperature coefficient of resistance and large electrical resistivity, so the importance and technical application as a resistor [1,2] in the electronics industry has increased [3]. At the same time, NiCr coatings are widely used in coal-fired boilers [4,5], ship impellers and other components [6,7] because of their good oxidation resistance, high thermal stability and corrosion resistance [8,9]. There are several ways to achieve high-performance coatings.…”