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Chinese Journal of Materials Research  2015, Vol. 29 Issue (4): 255-261    DOI: 10.11901/1005.3093.2014.405
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Influence of Flaky Nickel Powder on Permeation Resistance of Fluorocarbon Coatings
Siqi WANG1,Fuchun LIU1,**(),Junjun CHEN2,En-Hou HAN1,Song XU2,Botao HU2,Jiazheng LU2
1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Hunan Electric Power Corporation Research Institute, Changsha 410007, China
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Siqi WANG,Fuchun LIU,Junjun CHEN,En-Hou HAN,Song XU,Botao HU,Jiazheng LU. Influence of Flaky Nickel Powder on Permeation Resistance of Fluorocarbon Coatings. Chinese Journal of Materials Research, 2015, 29(4): 255-261.

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Abstract  

The influence of flaky nickel powder as pigment on the permeation resistance of fluorocarbon based coatings was investigated by salt spray tests, EIS tests and measurement of water vapor transmission rate. The results show that among others the coating with a volume fraction 5% of flaky nickel powder exhibited the best comprehensive performance, however its resistance to water permeation degraded greatly for the coating with higher volume fraction of flaky nickel powder up to 15%.
Key words:  materials failure and protection      flaky nickel powder      fluorocarbon coating      salt spray test      EIS      permeation resistance     
Received:  11 August 2014     
Fund: *Supported by National Science and Technology Support Program No.2012BAB15B00, and State Grid Practical Project No. KG12K16004.
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Siqi WANG
Fuchun LIU
Junjun CHEN
En-Hou HAN
Song XU
Botao HU
Jiazheng LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.405     OR     https://www.cjmr.org/EN/Y2015/V29/I4/255

Fig.1  SEM image of the flaky nickel powder
PVC of nickel powder/% Adhesion /Grade Flexibility /mm Impact resistance /kgcm-1
0 1 1 50
5 1 1 50
15 1 1 50
25 1 1 50
35 1 1 50
Table 1  The mechanical properties of coatings
Fig.2  Coated panels after salt spray tests for 800 h, (a) 0, (b) 5%, (c) 15%, (d) 25%, (e) 35%
Fig.3  XRD spectra of Ni 5% coated panels in scribe area before (a) and after (b) salt spray test
Fig.4  Bode and Nyquist plots of the coated panels with different contents, (a) 0, (b) 5%, (c) 15%, (d) 25%, (e) 35%
Fig.5  EEC models for the coated panels at different immersion stages, (a) equivalent circuit for the intact coating with one time constant, (b) equivalent circuit for the coating with two-time constants, (c) equivalent circuit for the coating with two-time constants and Warburg impedance
Fig.6  The change of coating resistance with immersion time
Fig.7  Change of water absorption of the coatings with immersion time
Content of nickel powder/% Transmission rate of water vapor /g/(m2d)
0 9.929
5 3.922
15 2.112
25 13.5055
35 1219.863
Table 2  Water vapor transmission rates of coatings
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