论文部分内容阅读
研究了工业纯铁、Fe-Cr和Fe-Al合金表面有Na_2SO_4沉积时于O_2/SO_2/SO_3气氛中的低温热腐蚀行为。测定腐蚀动力学曲线,研究温度、气体组成及合金元素对腐蚀动力学的影响,并对腐蚀产物的形貌和组成进行观察与分析。结果表明,在工业纯铁、Fe-Cr和Fe-Al合金的低温热腐蚀过程中都发生金属表面致密氧化层的快速成长和疏松的Fe_2O_3在盐膜中的沉积,且前者对腐蚀的贡献居大。以实验结果为依据,初步提出了电化学机理模型,并用以阐述铁基合金低温热腐蚀过程。
The low temperature hot corrosion behavior of industrial pure iron, Fe-Cr and Fe-Al alloys in the presence of Na_2SO_4 in O_2 / SO_2 / SO_3 atmosphere was investigated. The corrosion kinetics curves were measured, the effects of temperature, gas composition and alloying elements on corrosion kinetics were studied, and the morphology and composition of corrosion products were observed and analyzed. The results show that rapid growth of dense metal oxide layer and loose Fe_2O_3 deposition in the salt film occur during low temperature hot corrosion of pure iron, Fe-Cr and Fe-Al alloys, and the former contributes to corrosion. Big. Based on the experimental results, a preliminary electrochemical model was proposed and used to illustrate the low temperature hot corrosion process of Fe-based alloys.