| ZOU Yunhe,WANG Jian,TAN Yong,XU Fei,SUN Jie.Corrosion Behavior of Thermal Spraying NiCrAl Coating on Different Substrates[J],54(8):107-115 |
| Corrosion Behavior of Thermal Spraying NiCrAl Coating on Different Substrates |
| Received:July 12, 2024 Revised:October 18, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.08.009 |
| KeyWord:APS NiCrAl coating galvanic corrosion wavelet analysis |
| Author | Institution |
| ZOU Yunhe |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| WANG Jian |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| TAN Yong |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| XU Fei |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| SUN Jie |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
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| Abstract: |
| Abradable seal coating (ASC) has a porous, multi-layer and multi-phase structure. When the ASC is in a corrosive environment, the galvanic corrosion of the substrate-bonding coating or the bonding coating-top coating becomes an important reason for accelerating the failure of the ASC system. At present, NiAl bonding coating is usually used as bonding layer in ASC system, but the research on galvanic corrosion between NiCrAl bonding coating and substrate is lacking. In this study, NiCrAl coatings were prepared on FeCoNi superalloy and (1Cr11Ni2W2MoV) stainless steel substrates by atmospheric plasma spraying (APS). The measurement methods, including scanning electron microscopy (SEM), 3D confocal laser scanning microscope (CLSM), X-ray diffraction (XRD) and electrochemical tests (open circuit potential test (OCP), potentiodynamic polarization curve test and galvanic corrosion test), were used to characterize the corrosion behaviors of NiCrAl bonding coating, and the galvanic corrosion behaviors of NiCrAl bonding coating on FeCoNi superalloy and stainless steel substrates in 3.5wt.% NaCl solution. The results showed that partial phase transformation of NiCrAl powder occurred after spraying, and the formation of Al2O3 increased the corrosion resistance of the coating. The NiCrAl coatings for different immersion time were observed by CLSM, and the results of CLSM were processed by image method. The results showed that the porosity and surface roughness of NiCrAl coating decreased firstly and then increased. Combined with the micro-morphology and energy spectrum of NiCrAl coating surface for different immersion time, this was due to the accumulation of corrosion products on the surface of the coating in the pores at the early stage of immersion, and the cracking and shedding of corrosion products at the later stage of immersion. After 240 hours of immersion, clear corrosion channels were observed at the cross section of the coating, indicating that the substrate had been corroded. The experimental results showed that when the corrosive medium reached the interface between the coating and the substrate through the corrosion channel, local micro-galvanic corrosion became the main cause of corrosion. The results of the potentiodynamic polarization curve analysis indicated that, compared with NiCrAl-FeCoNi superalloy, NiCrAl-stainless steel system had lower corrosion potential. |
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