Heat treatment is capable of improving the hardness and wear-resistance of nickel-boron alloy considerably.The as-plated Ni-B alloy coating is noncrystalline.During heat treatment

its structure begins converting to crystalline and nickle crystal is precipitated at 250℃.Ni

3

B is precipitated at 300℃.Electroless Ni-B alloy coating has significant hardness

superior wear-resistance and excellent electrical properties.It can be used instead of gold or silver in some electrical components.Studies on the technology

structure and properties of electroless Ni-B coatings have been reported in domestic and foreign journals

but some aspects need additional study.This paper discusses the structure and properties of electroless nickel-boron alloy coatings

using sodium borohydride as reducing agent and ASE as stabilizer on brass.The effect of heat treatment temperature on structure and hardness are studied especially.