Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating
The 1Cr18Ni9Ti stainless steel with Al-Si/Al-Si-Cr coatings is prepared by slurry process and vacuum diffusion, and the hot corrosion behavior of the stainless steel with/without the coatings is studied under the condition of Na2SO4 film at 950 °C in air. Results show that the corrosion kinetics of...
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| Language: | English |
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De Gruyter
2017-03-01
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| Series: | High Temperature Materials and Processes |
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| Online Access: | https://doi.org/10.1515/htmp-2015-0154 |
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| author | Fu Guangyan Wu Yongzhao Liu Qun Li Rongguang Su Yong |
| author_facet | Fu Guangyan Wu Yongzhao Liu Qun Li Rongguang Su Yong |
| author_sort | Fu Guangyan |
| collection | DOAJ |
| description | The 1Cr18Ni9Ti stainless steel with Al-Si/Al-Si-Cr coatings is prepared by slurry process and vacuum diffusion, and the hot corrosion behavior of the stainless steel with/without the coatings is studied under the condition of Na2SO4 film at 950 °C in air. Results show that the corrosion kinetics of stainless steel, the stainless steel with Al-Si coating and the stainless steel with Al-Si-Cr coating follow parabolic laws in several segments. After 24 h corrosion, the sequence of the mass gain for the three alloys is the stainless steel with Al-Si-Cr coating < the stainless steel with Al-Si coating < the stainless steel without any coating. The corrosion products of the three alloys are layered. Thereinto, the corrosion products of stainless steel without coating are divided into two layers, where the outside layer contains a composite of Fe2O3 and FeO, and the inner layer is Cr2O3. The corrosion products of the stainless steel with Al-Si coating are also divided into two layers, of which the outside layer mainly consists of Cr2O3, and the inner layer is mainly SiO2. The corrosion film of the stainless steel with Al-Si-Cr coating is thin and dense, which combines well with substrate. Thereinto, the outside layer is mainly Cr2O3, and the inside layer is Al2O3. In the matrix of all of the three alloys, there exist small amount of sulfides. Continuous and protective films of Cr2O3, SiO2 and Al2O3 form on the surface of the stainless steel with Al-Si and Al-Si-Cr coatings, which prevent further oxidation or sulfide corrosion of matrix metals, and this is the main reason for the much smaller mass gain of the two alloys than that of the stainless steel without any coatings in the 24 h hot corrosion process. |
| format | Article |
| id | doaj-art-4bfe629b8d7c4dbfb214a14d9c86a57c |
| institution | Kabale University |
| issn | 0334-6455 2191-0324 |
| language | English |
| publishDate | 2017-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | High Temperature Materials and Processes |
| spelling | doaj-art-4bfe629b8d7c4dbfb214a14d9c86a57c2024-12-16T08:57:06ZengDe GruyterHigh Temperature Materials and Processes0334-64552191-03242017-03-0136324324810.1515/htmp-2015-0154Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr CoatingFu Guangyan0Wu Yongzhao1Liu Qun2Li Rongguang3Su Yong4College of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China College of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China College of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China College of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China The 1Cr18Ni9Ti stainless steel with Al-Si/Al-Si-Cr coatings is prepared by slurry process and vacuum diffusion, and the hot corrosion behavior of the stainless steel with/without the coatings is studied under the condition of Na2SO4 film at 950 °C in air. Results show that the corrosion kinetics of stainless steel, the stainless steel with Al-Si coating and the stainless steel with Al-Si-Cr coating follow parabolic laws in several segments. After 24 h corrosion, the sequence of the mass gain for the three alloys is the stainless steel with Al-Si-Cr coating < the stainless steel with Al-Si coating < the stainless steel without any coating. The corrosion products of the three alloys are layered. Thereinto, the corrosion products of stainless steel without coating are divided into two layers, where the outside layer contains a composite of Fe2O3 and FeO, and the inner layer is Cr2O3. The corrosion products of the stainless steel with Al-Si coating are also divided into two layers, of which the outside layer mainly consists of Cr2O3, and the inner layer is mainly SiO2. The corrosion film of the stainless steel with Al-Si-Cr coating is thin and dense, which combines well with substrate. Thereinto, the outside layer is mainly Cr2O3, and the inside layer is Al2O3. In the matrix of all of the three alloys, there exist small amount of sulfides. Continuous and protective films of Cr2O3, SiO2 and Al2O3 form on the surface of the stainless steel with Al-Si and Al-Si-Cr coatings, which prevent further oxidation or sulfide corrosion of matrix metals, and this is the main reason for the much smaller mass gain of the two alloys than that of the stainless steel without any coatings in the 24 h hot corrosion process.https://doi.org/10.1515/htmp-2015-0154stainless steelal-si coatingal-si-cr coatinghot corrosion81.65. kn |
| spellingShingle | Fu Guangyan Wu Yongzhao Liu Qun Li Rongguang Su Yong Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating High Temperature Materials and Processes stainless steel al-si coating al-si-cr coating hot corrosion 81.65. kn |
| title | Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating |
| title_full | Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating |
| title_fullStr | Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating |
| title_full_unstemmed | Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating |
| title_short | Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating |
| title_sort | hot corrosion behavior of stainless steel with al si al si cr coating |
| topic | stainless steel al-si coating al-si-cr coating hot corrosion 81.65. kn |
| url | https://doi.org/10.1515/htmp-2015-0154 |
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