In this work, NiB coatings were electrodeposited on the 8620H steel substrates, the substrates were carried out with different pretreatment including without pretreatment, after sandblasting by glass sand and after sandblasting by emery powders. The results of scratch test indicated that the best adhesion strength of NiB coatings occurred at the 8620H steel substrates carried out with sandblasting by emery powders, the NiB coatings still did not be damaged when the load increase to 50 N. The icorr values of NiB coatings deposited on different pretreatment condition such as without pretreatment, after sandblasting by glass sand and after sandblasting by emery powders are approximately at 9.46×10-6 , 8.62×10-6 and 2.31×10-6 A/dm 2 , respectively. All the samples carried out with a wear process at a load of 20 N, the icorr values of NiB coatings deposited on different conditions 1.96×10-5 , 1.54×10-5 and 6.72×10-6 A/dm 2 , respectively. The results show that the NiB coatings deposited on the 8620H steel substrates carried out with sandblasting by emery powders has the best adhesion strength and corrosion resistance due to the NiB coatings did not be damaged during wear process.

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