摘要
以往对渗铝钢耐热腐蚀性能的研究缺乏深度,为解决实际问题,在750℃模拟灰垢熔盐体系中,研究了加热炉辐射室炉管常用材料20G钢、20G渗铝钢、Cr5Mo钢、Cr5Mo渗铝钢的腐蚀行为。结果表明:20G钢、Cr5Mo钢、20G渗铝钢和Cr5Mo渗铝钢抗熔灰腐蚀能力依次增强;渗铝可以大大提高合金的耐熔灰腐蚀性能,在纯空气中氧化,其耐蚀性能也十分优异;20G渗铝钢在熔灰腐蚀时元素Al优先氧化并不十分明显,Cr5Mo渗铝钢在熔灰腐蚀时元素Al优先氧化;按照电化学模型,在熔灰腐蚀中V2O5不但会溶解金属氧化物的保护层,而且还参与阴极过程,循环反应,加速了金属的氧化腐蚀。
In an attempt to deepen the research on the hot corrosion behavior of aluminized steel, the corrosion behavior of 20G steel, 20G aluminized steel, Cr5Mo steel, and Cr5Mo aluminized steel commonly used as the tubes in the radiation chamber of a furnace was investigated using a simulated ash molten system at 750 ℃. Results showed that the corrosion resistance of the tested steels in the molten ash was greatly increased by the aluminizing, and the hot corrosion resistance of the steels in the molten ash was ranked as 20G<Cr5Mo<aluminized 20G<aluminized Cr5Mo. Moreover, the aluminized steel showed good oxidation resistance in air at 750 ℃ as well. While corroded in the molten ash, the 20G aluminized steel showed unobvious preferential oxidation of Al, but the Cr5Mo aluminized steel showed prominent preferential oxidation of Al. It was supposed, according to the related electrochemical theory, that (V_2O_5) not only functioned to dissolve the metal oxide film but also took part in the cathodic process and hence accelerated the oxidationcorrosion of the metal in the molten ash.
出处
《材料保护》
CAS
CSCD
北大核心
2005年第4期1-5,共5页
Materials Protection
