The invention relates to a surface hardening method for
martensite stainless steel. In the technical scheme, the surface hardening method comprises the following steps of: putting a processed
martensite stainless steel workpiece on a
workbench of a
vacuum chamber of an
ion implanter, vacuumizing until the pressure is between 2.0*10<-3> and 3.0*10<-3>Pa, and removing a
passivation layer on the surface of the workpiece by using an
ion cleaning source; and implanting
nitrogen ions to the
martensite stainless steel workpiece of which the surface
passivation layer is removed under the conditions that: the vacuum degree is between 5.0*10<-4> and 5.0*10<-2>Pa, the accelerating
voltage of the
ion source is between 10 and 100 kV, and the implantation
dose is between 5.0*10<15> and 5.0*10<19> ions /
centimeter<2> to obtain the surface-hardened martensite stainless steel, wherein the operating conditions of the cleaning source include:
filament current is between 6 and 10 A,
arc voltage is between 40 and 70 V, extraction
voltage is between 0.6 and 1.5 kV, and extraction current is between 40 and 70 mA. The surface hardening method has the characteristics of simple process and no
pollution in the
processing process; and the abrasion performance and
hardness of the surface of the product processed by the method are improved substantially, the combination between a hardening layer and a stainless steel substrate is firm, and the service life is long.