2SO4+25% K2SO4混合鹽中熱腐蝕特性。結(jié)果表明，Cr含量對熔覆層的高溫特性起著關(guān)鍵作用。提高Cr含量對提升熔覆層抗硫酸鹽誘導(dǎo)的熱腐蝕能力比提升抗循環(huán)高溫氧化能力更有效。Cr40涂層抗高溫氧化和熱腐蝕性能最佳。Cr10的氧化產(chǎn)物以NiO為主，極易脫落，內(nèi)部氧化嚴(yán)重。雖然Cr40表面可以形成單一的Cr2O3層，但熱應(yīng)力和生長應(yīng)力引起的富Cr氧化物內(nèi)部開裂，使Cr40的抗循環(huán)高溫氧化能力僅略好于Cr20。面對熱腐蝕時(shí)，Cr10表面呈現(xiàn)層狀NiO和Ni3S2疊層分布的腐蝕產(chǎn)物，內(nèi)部腐蝕區(qū)也生成了Ni的硫化物。Cr20表面Cr2O3層被破壞，內(nèi)部腐蝕嚴(yán)重，生成了CrS。Cr40表面生成了致密的Cr2O3保護(hù)層，有效地防止了進(jìn)一步腐蝕。;Ni-Cr alloy cladding layers with Cr contents of 10wt%, 20wt%, and 40wt% were prepared by laser melting technique and their high temperature oxidation characteristics at 900 °C and hot corrosion characteristics in Na2SO4+25wt% K2SO4 mixed salt at 600 °C were investigated. The results show that the Cr content plays a key role in the high temperature characteristics of cladding layers. Increasing the Cr content is more effective in improving the resistance of cladding layers to sulfate-induced hot corrosion than in improving the resistance to cyclic high-temperature oxidation. Cr40 provides the best resistance to high-temperature oxidation and hot corrosion. The oxidation products of Cr10 are dominated by NiO, which is extremely easy to shed and the internal oxidation is serious. Although a single Cr2O3 layer can be formed on the Cr40 surface, cracking within the Cr-rich oxides caused by thermal and growth stresses renders the resistance of Cr40 to cyclic high-temperature oxidation only slightly better than that of Cr20. Suffering from hot corrosion, the surface of Cr10 presents lamellar NiO and Ni3S2 stacked distribution of corrosion products, and Ni sulfide is also generated in the inner corrosion zone. The Cr2O3 layer on Cr20 surface is destroyed, and internal corrosion is severe, generating CrS. A dense protective Cr2O3 layer is generated on Cr40 surface, efficiently preventing further corrosion."/>