Basic Study of Adhesion of Several Alumina‐based Washcoats Deposited on Stainless Steel Microchannels

The adhesion of several washcoats deposited on stainless steel microchannels was investigated by performing a mechanical test (drop test) after application‐oriented tests, temperature cycling, and water exposure. For this study alumina washcoats (γ‐Al₂O₃) and washcoats of commercially available alumina‐based catalyst powders (Pt/Al₂O₃, Rh/Al₂O₃) were used. The deposited washcoats showed very good adhesion not only for fresh samples but also after the application‐oriented tests.