The invention discloses a method for protecting the surface of a
water cooling wall tube of a boiler. The method includes the process steps of
shot peening treatment and supersonic arc spraying, and specifically includes the following steps that a, surface pretreatment is conducted, specifically, sundries on the surface of the
water cooling wall tube are cleared; b,
shot peening is conducted, specifically, the surface of the
water cooling wall tube are subjected to
ultrasonic shot peening treatment by projectiles ejected by an ultrasonic shot-
blasting machine; c, spraying is conducted, specifically, after
shot peening, supersonic arc spraying equipment is used for spraying an HDS-88A
coating on the water cooling wall tube after shot
peening treatment, and the thickness of the
coating is 0.6-0.8 mm; and d, hole sealing is conducted, specifically, the HDS-88A
coating is subjected to hole sealing through a hole sealing agent. According to the method for protecting the surface of the watercooling wall tube of the boiler, the technologies of
ultrasonic shot peening and supersonic spraying are combined, properties such as
wear resistance, fatigue fracture resistance and
corrosion resistance of the water cooling wall tube are effectively improved, and the service life of the water cooling wall tube is prolonged.