Computer-Based Development of Interdiffusion Coatings for High-Temperature-Corrosion Protection of Low-Alloy Steels

该双边研究项目旨在开发和计算机模拟一种新的概念，在高温应用中的低合金钢顶部应用防腐蚀互扩散层，例如，在发电方面。将通过电沉积（克兰菲尔德大学）将Ni、Cr和Al的单独层施加到样本上。调整电镀样品的真空热处理可以生成定制的梯度涂层，能够保护基材免受高温腐蚀。这将通过氧化试验（奥斯纳布吕克应用科学大学UOS）证明。UOS项目的重点是开发一个基于元胞自动机方法的计算机模型，该模型考虑了多元素的相互扩散，包括（一）体扩散和晶界扩散之间的分离，（二）机械应力效应和（三）Kirkendall孔隙的形成。因此，相互扩散涂层过程将建模和预测的目标，以优化腐蚀防护。

The bilateral research project aims at the development and computer modeling of a novel concept to apply corrosion-protective interdiffusion layers on top of low alloy steels for high-temperature applications, e.g., in power generation. Individual layers of Ni, Cr and Al will be applied to specimens by electrodeposition (Cranfield University). Adjusting a vacuum heat treatment of the electroplated specimens allows the generation of tailor-made gradient coatings that are capable to protect the substrate against high-temperature corrosion. This will be proven by oxidation testing (Univ. of Applied Sciences Osnabrück UOS). Focus of the project at UOS is the development of a computer model based on the cellular automat approach that accounts for multi-element interdiffusion, including (i) separation between bulk and grain boundary diffusion, (ii) mechanical stress effects and (iii) the formation of Kirkendall porosity. As a result, the interdiffusion coating process will be modeled and predicted with the objective to optimize the corrosion protection.