Corrosion Behavior of High-Cr–Ni Materials in Biomass Incineration Atmospheres

Abstract

In this paper, the corrosion test of high-Cr–Ni tubes was carried out in a biomass incinerator by replacing the original heated surface tube with a test tube. The investigated materials are high-Cr–Ni stainless steels (TP347H, SP2215, and Sanicro25) and alloy (HT700T). Long-term services (>4000 h) to investigate the corrosion rates and corrosion characteristics of the materials have been carried out. The appearance, element content, and composition of corrosion products after corrosion of the specimens were analyzed. Analysis indicates that the deposits are mainly composed of alkali metal salts, iron oxides, iron sulfates, and complex salts. Moreover, the corrosion morphology of the materials with different Cr–Ni contents varies greatly. TP347H has a high corrosion rate (0.11 mm/1000 h) with intergranular corrosion cracks and pitting on the windward side. However, the corrosion pattern of HT700T is comprehensive corrosion and the corrosion rate is low (0.015 mm/1000 h). Using corrosion rate as a criterion for corrosion resistance, HT700T has the highest corrosion resistance, while TP347H has the lowest. The corrosion behavior is also related to the corrosion resistance index (CI) value based on the content of critical elements. The order of material corrosion resistance predicted by the CI value is the same as reflected by the corrosion rate.

Sustainable New Technology for the Improvement of Metallic Materials for Future Energy Applications

“…Different types of catalysts are used for the pyrolysis of different types of source based biomasses (waste, plants, etc.) [89,90].…”

“…The main challenges that are facing metallic materials in the biomass sector are corrosion (pitting corrosion, intergranular corrosion, etc.) [89], high-temperature corrosion, and microbial-assisted corrosion [89,91]. The factors that strongly influence all types of the corrosion are fluid dynamics (including different solutions), gas composition (N 2 , CO 2 , H 2 O, Cl 2 , H 2 , etc.…”

“…The factors that strongly influence all types of the corrosion are fluid dynamics (including different solutions), gas composition (N 2 , CO 2 , H 2 O, Cl 2 , H 2 , etc. [90]), deposit composition, and temperature (573-1173 K) [89,90].…”

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

“…This steel also has significant creep strength at high temperatures, and shows only a slight decrease in fatigue strength at a peak stress below 450 MPa at 700 • C [14]. Weiet al [15] found that pitting occurs in SP2215 during long-term service under a steam temperature of 520 • C and a flue gas temperature of 1090 • C (>4000 h), which was attributed to the lack of protection by the passivation layer.…”

Corrosion Behavior of 20G and TP347H in Molten LiCl-NaCl-KCl Salt

“…TP347H austenitic stainless steel, because of its excellent corrosion resistance, good high-temperature strength and creep properties, is widely used in superheaters, power plant boilers and biomass boilers [ 20 , 21 , 22 , 23 ]. Compared with TP347H, 20G is a typical low Cr carbon steel and is widely used in heating the surface of boilers and oil and natural gas transmission pipes owing to its low cost, thermal formability and weldability [ 24 , 25 , 26 ].…”