The invention discloses an aluminum
alloy radiator and a surface cold
copper spraying process, and belongs to the technical field of radiator
machining. The preparation method comprises the following steps: selecting high-purity spherical
copper powder, carrying out
surface roughening pretreatment, impacting the
copper powder on a substrate at a high speed of 300-800m / s by utilizing heating gas at 400-600 DEG C under the protection of
inert gas, carrying out layered spraying for 3-8 times to form a 0.1-0.5 mm
coating, and finally carrying out vacuum packaging. According to the method provided by the invention, the defects that the copper
powder is easy to oxidize, the
thermal damage of a matrix is large, the
binding force of a
coating is poor and the like in a
thermal spraying process are effectively overcome. The
oxidation rate of the prepared
copper coating is lower than 1%, the
porosity is smaller than 3%, the
bonding strength reaches up to 40-80 MPa, the heat
conductivity coefficient exceeds 380 W / (m.K), and the salt spray
corrosion resistance exceeds 500 hours. The process has the advantages of low-temperature operation,
energy conservation and
environmental protection, the heat dissipation performance and reliability of the aluminum
alloy radiator are remarkably improved, and the service life of the aluminum
alloy radiator is remarkably prolonged.