论文部分内容阅读
通过加速腐蚀实验研究4种氧化铁皮组织对热轧带钢腐蚀性能的影响。实验结果表明,经过80周期的加速腐蚀后,组织由Fe_3O_4和FeO构成的氧化铁皮最耐腐蚀。组织由Fe_3O_4、共析产物(Fe_3O_4+Fe)构成的氧化铁皮耐腐蚀性能最差。在腐蚀初期,腐蚀产物在氧化铁皮表面的缺陷处优先形核,随后外锈层形成。随着外锈层逐渐长大,在氧化铁皮缺陷处形成的腐蚀产物的体积变大。氧化铁皮缺陷处会形成裂纹并扩展到基体,形成内锈层的腐蚀核。在腐蚀后期,外锈层厚度继续长大,结合面处的腐蚀核长大形成内锈层,这时氧化铁皮失去保护作用。
The effect of four kinds of scale on the corrosion behavior of hot strip was investigated by accelerated corrosion test. The experimental results show that after 80 cycles of accelerated corrosion, the scale formed by the Fe 3 O 4 and FeO oxide scale most corrosion-resistant. The corrosion resistance of the iron oxide scale composed of Fe_3O_4 and eutectoid products (Fe_3O_4 + Fe) was the worst. In the early stages of corrosion, the corrosion products preferentially nucleate defects on the surface of the scale, followed by the formation of an external rust layer. As the outer rust layer grows larger, the volume of corrosion products formed at the scale defects becomes greater. Oxide scale defects will form cracks and extended to the matrix, the formation of corrosion rust nuclei. In the late period of corrosion, the thickness of the outer rust layer continues to grow, and the corrosion rust nucleation and growth at the junction surface form an inner rust layer, and the oxide scale loses its protective effect.