A new technique of surface coating on steels by pressure friction has been developed. The result shows that the thickness of surface coating layers on SAE1045 steel depends on pressure and friction time. When the pressure is less than 10 MPa, the temperature on the friction interface is lower than the melting point of the coating alloy and no coating layer is built. If the pressure is higher than 20 MPa, the coating alloy flows off the interface, and thus the thickness of the coating layer decreases. The necessary friction time to melt the coating alloy is ∼10 s. If the friction time is longer than 20 s, a similar case of high pressure takes place, i.e. the coating melt also flows off the interface.
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