To provide a cost effective and efficient method for delamination of a base body (3) of a turbine blade (1) having a corrosion protective layer (11).

An outer segment (13) of the corrosion protective layer (11) is removed by peeling using jet water (23). In succession, an inner segment (15) of the corrosion protective layer (11) is chemically removed. The efficient and inexpensive delamination of the corrosion protective layer (19) is made possible if these two methods are adopted.