▎ 摘　　要

NOVELTY - The coating has a metal plate base material (1) whose surface is sequentially provided with a composite metal layer (2). A nano conductive layer (3) is covered on a surface of the composite metal layer, where thickness of the composite metal layer is about 5-3000 nm. A metal corrosion resistant layer (21), a metal self-healing layer (22) and a metal catalytic layer (23) are arranged sequentially arranged together from inside to outside, where thickness of the nano conductive layer is about 5-500 nm. The nano conductive layer is selected from a carbon-based material graphite, an amorphous carbon, a carbon graphene and carbide. USE - Proton exchange membrane fuel cell bipolar plate metal composite coating for use in an automobile, an unmanned aerial vehicle and a fixing power station. ADVANTAGE - The metal composite coating can weaken the corrosion of the metal plate base material in the service process of the battery, so as to prolong the durable service life of the proton exchange membrane fuel cell. The metal self-healing layer prevents the corrosion solution in the fuel cell environment from penetrating into the metal polar plate base through the filling and repairing function, and the metal catalytic layer inhibits the increase of the corrosion factor concentration in the corrosion solutions in the long-time operation process of battery through the catalytic decomposition. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a bipolar plate metal composite coating of a proton exchange membrane fuel cell. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a proton exchange membrane fuel cell bipolar plate metal composite coating. 1Metal plate base material 2Composite metal layer 3Nanometer conductive layer 21Metal corrosion resistant layer 22Metal self-healing layer 23Metal catalytic layer