Surface treatment method for composite material blade of helicopter

The invention discloses a surface treatment method for a composite material blade of a helicopter, and belongs to the technical field of the surface treatment of composite materials. The method is characterized by solving the problems of falling, cracking and aging of a coating during the use of the composite material blade by improving the conventional surface treatment technology for the composite material. Normal temperature slight corrosion technology of metal is used on leading edge coating iron of the composite material blade for solving the problem of surface chemical treatment of the composite material blade before the leading edge coating iron is painted. The method comprises the following steps of: filling pinholes on the surface of the composite material blade with epoxy putty;coating an epoxy primer to enhance the bonding force of the paint layer; coating a wash primer to solve the problem of the bonding force between the leading edge coating iron and the paint layer; andcoating a polyurethane finish. Compared with the prior art, the method of the invention solves the problem of the surface chemical treatment of the composite material blade before the leading edge coating iron is painted, so that the problem of paint peeling of the leading edge coating iron of the composite material blade is solved.