scholarly journals Fundamental Investigations on the High-Temperature Corrosion of Spinel-Forming Alumina Castables by Steel Slags

2022 ◽  
Vol 12 (2) ◽  
pp. 704
Author(s):  
Jakub Ramult ◽  
Klaudia Wiśniewska-Tobiasz ◽  
Ryszard Prorok ◽  
Dominika Madej
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Corrosion Test ◽  
Steel Slag ◽  
High Temperature Corrosion ◽  
Mass Ratio ◽  
Narrow Temperature Range ◽  
Coating Method ◽  
Alumina Castables ◽  
Static Corrosion

This study investigated the effect of the CaO/SiO2 mass ratio of steel slag on the corrosion behavior of spinel-forming alumina-based castables with a content of MgO (3–7 wt.%). Equiweight mixtures of castables and slags were calculated by FactSage, observed by HMTA, fired at 1350 °C, and investigated by XRD. From these results, we conclude that the presence of SiO2-rich phases accelerates the growth of the liquid phase in a narrow temperature range for the tested samples, which accelerates the degradation of castables. The static corrosion test was conducted by means of the coating method at 1450 °C. The corrosion index (IC) in the regions of castables affected by slags was calculated. Phases and phase distributions were evaluated by SEM-EDS. From these results, we conclude that for the slag with the lowest mass ratio of CaO/SiO2 (1.1), the reaction zone occurs only below the slag-refractory interface, which indicates the aggressive character of this slag.

High Temperature Corrosion Behavior of Si-Containing Alloys in the Liquid Phase of Na2SO4 25.7 Mass% NaCl

2012 ◽  
Vol 323-325 ◽  
pp. 353-358 ◽  
Author(s):  
Toto Sudiro ◽  
Tomonori Sano ◽  
Shoji Kyo ◽  
Osamu Ishibashi ◽  
Masaharu Nakamori ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Corrosion Behavior ◽  
High Temperature Corrosion ◽  
Corrosion Mechanism ◽  
Plasma Sintering ◽  
Ni Addition ◽  
Spark Plasma ◽  
Si Content ◽  
Conicraly Alloy

The high temperature corrosion behavior of Si-containing alloys consisting of Cr-Si-Ni and CoNiCrAlY-Si alloys fabricated by spark plasma sintering technique was investigated in the liquid phase of Na2SO4 + 25.7 mass% NaCl at temperatures ranging from 923-1273 K. The purpose of this study is to develop excellent corrosion resistant alloys for coating applications. Our experimental results show the CrSi2 alloy with 10 mass% Ni content and the CoNiCrAlY alloy with 30 mass% Si content are the most promising materials for applications in this atmosphere. This is due to the formation of a protective SiO2 and Al2O3/SiO2 scale, respectively. The formation of a dense and continuous oxide layer composed and/or consisted of SiO2 plays a significant role in hindering the inward diffusion of chlorine and sulfur to the alloys substrate. Particularly, the corrosion mechanism of Cr-Si-Ni alloys and the influence of Ni addition on the corrosion resistance of CrSi2 alloy are discussed in the present paper.

Accelerated Corrosion of Stainless Steels in the Presence of Molten Carbonate below 923 K

1997 ◽  
Vol 496 ◽  
Author(s):  
Ken-ichiro Ota ◽  
Katsuya Toda ◽  
Naobumi Motohira ◽  
Nobuyuki Kamiya
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Corrosion Rate ◽  
Stainless Steels ◽  
Corrosion Test ◽  
Initial Period ◽  
High Temperature Corrosion ◽  
Molten Carbonate ◽  
Reaction Conditions ◽  
Accelerated Corrosion

ABSTRACTThe high temperature corrosion of stainless steels (SUS316L and SUS310S) in the presence of molten carbonate [(Li0.62K0.8)2CO3 and (Li0.52Na0.48)2CO3] has been studied in a CO2-O2 atmosphere by measuring the weight gain of the specimens.The corrosion of SUS316L significantly depended on the reaction conditions. With the carbonate coating (both Li/Na and Li/K carbonates), severe corrosion occurred during the initial period of the corrosion test below 923 K, especially around 823 K. The initial severe corrosion was a local corrosion which produced through holes in the metal specimens and occurred more clearly at low Pco2 with the Li/Na coating than with the Li/K coating. The corrosion became more severe at higher CO2 pressures and lower O2 pressures. In a pure CO2 atmosphere (without O2), the corrosion rate significantly increased at 823 K. The steel was corroded uniformly at that time.

High Temperature Corrosion Resistance of Siliconized Stainless Steel under Continuous Deposition of Salt

2011 ◽  
Vol 696 ◽  
pp. 266-271
Author(s):  
Naka Sato ◽  
Toshiya Kaneta ◽  
Michihisa Fukumoto ◽  
Motoi Hara
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Diffusion Layer ◽  
Corrosion Test ◽  
Silicon Oxide ◽  
High Temperature Corrosion ◽  
Silicon Iron ◽  
Continuous Deposition ◽  
Silicon Diffusion

The surface alloying of Si into SUS304 austenitic stainless steel was carried out by a halide-activated pack-cementation method. By this treatment, the silicon diffusion layer containing about 13 at.% Si was formed. The high temperature corrosion resistance of this specimen was evaluated under the continuous deposition of salt. The result of the corrosion test showed that the oxidation mass gain of the siliconized stainless steel was lower than that of non-treated stainless steel. It was found from the observation of the cross-section of the specimen after the corrosion test that a thin scale was formed on the silicon diffusion layer and silicon oxide was formed as an inner layer of the scale. A mechanism of the oxidation suppression for the siliconized steel under the continuous deposition of salt was investigated by the oxidation test of pure silicon, iron, chromium or nickel powder mixed with equimolar NaCl-KCl. As a result, it was found that the high corrosion resistance of the siliconized steel was attributable to the fact that the silicon oxide formed on the silicon diffusion layer was inert to the chemical reaction with the NaCl-KCl salt.

scholarly journals High Temperature Corrosion of CoNiCrAlY–Si Alloys in the Liquid Phase of Na2SO4–NaCl

2012 ◽  
Vol 53 (5) ◽  
pp. 920-925 ◽  
Author(s):  
Toto Sudiro ◽  
Shoji Kyo ◽  
Osamu Ishibashi ◽  
Masaharu Nakamori ◽  
Kazuya Kurokawa
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
High Temperature Corrosion

Experimental Study on Gas Atmosphere near Side Walls of Swirl Opposed Supercritical Boiler

2013 ◽  
Vol 732-733 ◽  
pp. 116-119
Author(s):  
Xing Sen Yang ◽  
Xin Gang Zhou
Keyword(s):  
High Temperature ◽  
Corrosion Test ◽  
Side Wall ◽  
Experimental System ◽  
High Temperature Corrosion ◽  
Test Area ◽  
Reducing Atmosphere ◽  
Gas Atmosphere ◽  
Co Concentration ◽  
Side Walls

High temperature corrosion of metal material was found on the side water-walls of a swirl-opposed firing supercritical boiler. The gas atmosphere near the side wall has great relationship with the high temperature corrosion. Test holes were installed on the side walls to form an experimental system. The gas compositions near the side walls were analyzed under different combustion conditions. High CO concentration is detected near the side walls. The effects of the operation states of burners on the CO concentration near side walls were tested. High over-fire air quantity results in strong reducing atmosphere of the test area. The adjusting method to control the atmosphere is suggested.

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