摘要
为了提高材料的抗热腐蚀性能,采用电弧喷涂方法在钢铁基体表面施加FeCrAl/Al复合涂层,通过沉积Na2SO4的900℃热腐蚀试验以及二硫化碳生产装置中的现场挂片试验,研究了FeCrAl/Al复合涂层的高温硫化表现。实验结果表明:FeCrAl/Al复合涂层提高了钢铁材料的抗高温硫化腐蚀能力,在高温硫化初期,外表面的Al涂层首先发生氧化,形成连续的Al2O3层,显著地减缓了硫原子向复合涂层内部的扩散速度。随着复合涂层中Cr、Al等有效抗硫化合金元素的相互扩散,形成FeCr金属间化合物层,进一步阻碍硫原子扩散,对钢铁基体材料提供有效的高温硫化防护作用。
In order to improve the material＇s ability to against sulphur attack under high temperature, arc-sprayed FeCrAVAl composite coatings on steel materials were studied in this work. The results of the laboratory experiments and the test under the Charcoal-Sulphur operating condition revealed that the arc sprayed composite coatings of FeCrAl/Al could well protect the steel substrate from high-temperature sulphide corrosion. In the early test, the surface Al coating was priority oxidized and formed into a continuous alumina layer which effectively slowed down the diffusion of sulphur into the steel substrate. After then, the diffusion of the elements including Cr and Al in the composite coatings resulted in the formation of an intermetallic compound which provided a further sulphide corrosion protection.
出处
《成都电子机械高等专科学校学报》
2011年第4期13-17,共5页
Journal of Chengdu Electromechanical College
基金
沈阳市科学技术局科技攻关项目"用热喷涂铁基涂层取代汽车发动机铸铁缸套的研究"(F-10-011-2-00)
关键词
电弧喷涂
高温
复合涂层
硫化腐蚀
铁铬铝
微观组织
扩散层
防护
Arc spray
High temperature
Composite coating
Sulphide corrosion
FeCrAl
Microstructure
Diffusion layer
Protection
