Abstract
Two different types of aluminide coatings on cyclic austenitic stainless steel 321 AISI, were investigated. One is based on predeposition of nickel by electrodeposition followed by aluminization using a pack cementation technique (double step- coating), while the other coating is based on codeposition of nickel and aluminium powder simultansly using a pack cementation (single step- coating).
The coating microstructure and intermetallic compound of the coating layers, as well as, coating thickness were identified using metallugraphy and X-ray analysis
The cyclic Oxidation test of the coating at elevated temperature reveals the formation of stable and protective scale -Al2O3 along the exposure time.