Comparative Study on Microstructure and Properties of Electroless Ni - P and Ni - W - P Coatings

YI Hongli, BAO Cuimin, CHEN Rui, YANG Zhipeng, CHEN Wei, LI Hongkun

doi:10.16577/j.issn.1001-1560.2022.0253

Materials Protection >

2022 , Vol. 55 >Issue 9: 102 - 108

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0253

Comparative Study on Microstructure and Properties of Electroless Ni - P and Ni - W - P Coatings

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(1.Dalian Turbine Machinery Technology Development Co., Ltd., Shenyang Blower Works Group Corporation, Dalian 116023, China;2. Shenyang Turbine Machinery Co., Ltd., Shenyang Blower Works Group Corporation, Shenyang 110869, China;3. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China)

Received date: 2022-03-21

Revised date: 2022-05-06

Accepted date: 2022-05-31

Online published: 2023-12-23

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Abstract

In order to better understand the advantages and disadvantages of electroless Ni - P and Ni - W - P coatings，X - ray diffractometer, optical microscope , electrochemical station, Vickers hardness tester and other test and analysis methods were used for the comparative study on the microstructure, adhesion, hardness and the corrosion resistance in particular working conditions of electroless Ni - P and Ni - W - P coatings in as - plated and heat - treated statuses. Results showed that the adhesion of two coatings with the substrate was good and both coatings had uniform thickness. The coatings showed well packed homogenous cells on their surfaces with a certain directionality and low porosity. The Ni - W - P coating started to crystallize at a lower heat treatment temperature than Ni - P coating. Besides, the Ni - W - P coating presented better ductility than Ni - P coating when the hardness of the coatings was higher than 800 HV3N. Meanwhile, the Ni - W - P coating had better anticorrosion property under certain corrosive service conditions.

Key words： electroless plating; Ni - P; Ni - W - P; film - substrate adhesion; hardness; heat treatment; corrosion resistance

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YI Hongli, BAO Cuimin, CHEN Rui, YANG Zhipeng, CHEN Wei, LI Hongkun . Comparative Study on Microstructure and Properties of Electroless Ni - P and Ni - W - P Coatings[J]. Materials Protection, 2022 , 55(9) : 102 -108 . DOI: 10.16577/j.issn.1001-1560.2022.0253

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