Hard alloy surface boriding treatment method

A hard alloy surface boriding treatment method belongs to the field of metal surface treatment and comprises four steps of surface hydroxylation enrichment treatment, preparation of coating slurry, slurry coating and drying and high-temperature boriding. The hard alloy with high hardness and good wear resistance is prepared at the boriding temperature of 850-950 DEG C, the Vickers hardness is 1246-1308 HV, and the volume abrasion loss is 1.06-1.46 * 10 mm < 3 >; through hydroxylation enrichment treatment on the surface of the alloy, the combination effect of boron-containing powder in coating slurry and the surface of the alloy is promoted, the boronizing process is promoted, and finally the mechanical property of the surface of the alloy is improved; and by adding two permeation promoters, namely lithium metaborate and lithium tetraborate, the boriding process on the surface of the alloy is promoted at a relatively low temperature, so that the high-hardness and high-wear-resistance hard alloy is obtain