Preliminary Studies on Rare Elements Addition and Effect on Oxidation Behaviour of Pack Cementation Coatings Deposited on Variety of Steels at High Temperature

Materials

Ewa Rząd¹  Wojciech Polkowski¹  Tomasz Polczyk¹  Adelajda Polkowska¹  Michal Wójcicki¹  Tomasz Dudziak¹  Katrin Jahns² 

[1] Centre for Corrosion Studies, Lukasiewicz Research Network—Krakow Institute of Technology, 73 Zakopianska Str., 30-418 Krakow, Poland;Steel Institute IEHK, RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany;

关键词: pack cementation;    oxidation;    rare elements;    XRD;    SEM;    EDS;   

DOI  :  10.3390/ma14226801

来源: DOAJ

【 摘 要 】

The aim of the paper was to investigate the air oxidation behaviour of pack aluminised steels exposed at 650 °C for 1000 h in static natural air atmosphere. The pack coatings were doped by rare elements such as gadolinium (Gd), cerium oxide (CeO₂), and lanthanum (La) in order to enhance the corrosion resistance and plasticity of the deposited layers. In this work, the following steels were used: 16M, T91, VM12, Super 304H, and finally SANICRO25. The results indicated a much higher corrosion resistance in the coated 16M, T91, and VM12 steels; the steels with a higher Cr content than 16 wt % Cr indicated a better behaviour in the uncoated state than in the coated state. However, the observed difference in mass gain between the uncoated and the coated austenitic steels was not enormous. Furthermore, the addition of RE elements to the coating showed some effect in terms of coating thicknesses and differences in the layer structures. The materials prior to testing and after the exposure were investigated using XRD, the SEM X-ray maps with an EDS instrument were used for particular samples to evaluate the phase identifications, element concentrations, microstructure, and chemical composition.

【 授权许可】

Unknown