Acid slurry for washcoating tends to cause acid pollution on substrate and active components and even reduces the loading capacity. To solve the problems, washcoat of γ-Al₂O₃ on FeCrAl mesh was prepared with acid-free slurry in this study. Effects of additives on loading and adhesive property were investigated. The macromorphology, microstructure, phase constituents, pore characteristics and adhesive strength of the washcoat were analyzed with scanning electron microscopy, X-ray diffraction, nitrogen physical adsorption and ultrasonic oscillation tests. Experimental results indicated that adding 0.7 wt% hydroxyethyl methyl cellulose (HEMC) to the slurry could improve the loading capacity and adhesive property of washcoats. With the same additive added, washcoats prepared by neutral slurry demonstrated the highest adhesive strength, with its bonding strength sharply reduced under strong acidic or alkaline conditions. More importantly, the washcoat prepared with acid-free slurry could disperse homogeneously on the structured substrate, which could enhance the mechanical properties of the washcoat. There was no blockage of the coated meshes. The maximum washcoat loading was 24.52% and the average mass loss after ultrasonic oscillation was 1.66%, showing a high loading capacity and excellent adhesive strength.

用于修补基面涂料的酸浆倾向于对基材和活性成分造成酸污染，甚至降低其负载能力。为了解决上述问题，修补基面涂层的的γ-Al ₂ ö ₃在这项研究中，用无酸浆料制备了FeCrAl丝网。研究了添加剂对负载量和粘合性能的影响。用扫描电子显微镜，X射线衍射，氮气物理吸附和超声振荡试验分析了修补基面涂层的宏观形貌，微观结构，相组成，孔特征和粘合强度。实验结果表明，在浆料中加入0.7 wt％的羟乙基甲基纤维素（HEMC）可以改善修补基面涂料的负载能力和粘合性能。在添加相同的添加剂的情况下，中性浆料制备的修补基面涂层显示出最高的粘合强度，在强酸性或碱性条件下其粘合强度急剧降低。更重要的是，用无酸浆料制备的修补基面涂层可以均匀地分散在结构化基材上，这可以增强修补基面涂层的机械性能。涂覆的网没有阻塞。修补基面涂料的最大载量为24.52％，超声振荡后的平均质量损失为1.66％，显示出高载量和出色的粘合强度。