Method for spray pickling, polishing and passivating stainless steel composite board and devices thereof

The invention relates to a method of stainless clad plate spray pickling, polishing and passivating and a device. The device is mainly consisted of a mounting rack (2), a sparge pipe (4), a scaffold (5), a perfusion tube (6), a recovery tank (7), a hot water vat (8), pickling bath (9), a polishing tank (10), a passivating tank (11), a pump (12), a drainage pipe (13), a tap-water pipe (14), an acidproof fluid supply valve (15), a hot water valve (16), an acidproof return liquid valve (17), and a water valve (18). Wherein, the mounting rack is arranged above the recovery tank. The sparge pipe subtended by the scaffold aims at the mounting rack. The sparge pipe is connected with the pump. The hot water valve and three acidproof fluid supply valves are connected in turn in a pipeline connecting the tap-water pipe and the pump. The hot water valve is connected with the hot water vat. Three acidproof fluid supply valves are separately connected with the pickling bath, the polishing tank and the passivating tank. A