Detector for bonding strength between surface thin layer metal coating and body of metal-based workpiece

The invention relates to a detector for the bonding strength between a surface thin layer metal coating and a body of a metal-based workpiece, and relates to the detection field of steam turbine, gasturbine and automobile industries, aiming to solve the problem that the bonding strength between the thin layer metal coating and the body of the metal-based workpiece cannot be detected with high precision in the prior art. A pull rod, a taper pin, a guide bushing and a bushing form a lateral stretching mechanism, and an outer casing and a pull cover form another lateral stretching mechanism; oneend of the tapered pin is a circular truncated cone, a groove matched with the circular truncated cone is formed in one end of the bushing, the circular truncated cone is assembled into the groove, the upper bottom of the circular truncated cone is flush with one end surface of the bushing, the flush surface is provided with a coating, the coating connects the taper pin with the bushing into a whole, and the other end of