Citation: Ying Ren, Gen-Shu Zhou, Dong-Lang Chai, Xiao-Ping Qiao. On the formation of the interlayer between Ni-P coating and AZ33 magnesium alloy substrate by means of in situ SEM observation[J]. Chinese Chemical Letters, ;2014, 25(6): 947-952. doi: 10.1016/j.cclet.2014.04.009 shu

On the formation of the interlayer between Ni-P coating and AZ33 magnesium alloy substrate by means of in situ SEM observation

1.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

Corresponding author: Ying Ren,
Received Date: 25 December 2013
Available Online: 1 April 2014
Fund Project: The authors are grateful for the financial support of NSFC (No. 51375379) (No. 51375379)

Pre-treatment process is the key step for electroless plating. Once a suitable pre-treatment film is in place, the desired metals can be plated. In this paper, Ni-P coating was successfully prepared on AZ33 magnesium alloy with Mg(OH)₂ pre-treatment film by electroless plating. To investigate the role of MgF₂ in Ni-P coating, the deposition procedures between Mg(OH)₂ pre-treatment film and Mg(OH)₂-MgF₂ pre-treatment film (a traditional process) were compared. The surfacemorphology variations of coatings were observed with scanning electron microscopy and the compositions were analyzed by energy dispersive spectrometry. The results showed that during the plating, both MgF₂ and Ni-P deposited at the initial stage, and MgF₂ distributed in the bottom of the coating, forming a transitional interlayer with Ni-P. According to the heat quench test, a poor adhesion of the coating mainly occurred between the MgF₂ and Ni-P coating.
- Electroless plating,
- Magnesium alloys,
- Ni-P coating,
- Interlayer,
- Deposition procedure
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沈阳化工大学材料科学与工程学院沈阳 110142