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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (6): 559-565    DOI: 10.11902/1005.4537.2016.124
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Preparation and Performance of Water-based Chromium-free Dacromet Coating
Qingpeng LI1,2(),Qian XU1,Jianguo LIU2,Chuanwei YAN2,Liang ZHANG3,Yuejun YIN3,Changzhi HAN3
1. School of Material and Metallurgy, Northeastern University, Shenyang 110142, China
2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Shenyang Hangda Technology Co., Ltd, Shenyang 110043, China
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Abstract  

A water-based chromium-free Dacromet coating was prepared with powders of Zn and Al as filler and silane A-187 as film forming material. The coatings were characterized by means of SEM with EDS and XRD, while their corrosion performance was investigated by using potentiodynamic measurement, NSS test and AC impedance spectra. The results showed that the water-based chromium-free Dacromet paint had excellent stability with no obvious change even after storage at 50 ℃ for 48 h; the surface of the applied coatings was smooth and compact without defects, while no tarnish spots could be observed after 480 h salt spray test. The Ecorr of the water-based chromium-free Dacromet coating shifts positively while its Icorr is two magnitudes lower in comparison to those of the bare substrate which indicated that the water-based chromium-free Dacromet coating had excellent corrosion resistance.
Key words:  Zn powder      Al powder      stability      water-based chromium-free      Dacromet coating     
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Qingpeng LI
Qian XU
Jianguo LIU
Chuanwei YAN
Liang ZHANG
Yuejun YIN
Changzhi HAN

Cite this article: 

Qingpeng LI,Qian XU,Jianguo LIU,Chuanwei YAN,Liang ZHANG,Yuejun YIN,Changzhi HAN. Preparation and Performance of Water-based Chromium-free Dacromet Coating. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 559-565.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.124     OR     https://www.jcscp.org/EN/Y2016/V36/I6/559

Time / h Viscosity / s State
0 70 Normal
1 70 Normal
5 68 Normal
10 73 Normal
24 72 Normal
36 73 Normal
48 71 Normal
60 80 Normal
72 85 Normal
96 95 Normal
120 120 Normal
Table 1  Stability of the water-based chromium-freeDacromet coating (50 ℃)
Fig.1  SEM micrographs of water-based chromium-free Dacromet coating (a) and the magnified image (b)
Content C O Al Si Fe Zn Mo
Atomic fraction / % 41.95 27.98 3.21 4.63 1.98 20.20 0.05
Mass fraction / % 19.35 17.19 3.32 4.99 4.26 50.70 0.19
Table 2  EDS illustration of the water-based chromium-free Dacromet coating
Fig.2  XPS spectra of the water-based chromium-free Dacromet coating (a), Si2p (b), O1s (c) and C1s (d)
Fig.3  Photographs of the water-based chromium-free Dacromet coating before (a) and after (b) NSS test for 480 h
Fig.4  Polarization curves for different samples in 5%NaCl solution
Material Ecorr / V Icorr / Acm-2 Rp / Ω
Substrate -0.72 1.91×10-4 1.11×102
Water-based chromium-free Dacromet coating -1.04 4.79×10-6 4.44×103
Table 3  Electrochemical parameters obtained from polarization curves for untreated and water-based chromium-free Dacromet coating
Fig.5  Nyquist plot for water-based chromium-free Dacromet coating in 5%NaCl solution with 0~336 h immersion time
Fig.6  Impendance module (a) and phase angle (b) plots of water-based chromium-free Dacromet coating in 5%NaCl solution with 0~336 h immersion time
Time / h R1Ωcm2 CPE1-TFcm-2 CPE1-P R2Ωcm2 CPE2-TFcm-2 CPE2-P R3Ωcm2 W1-R W1-T/Fcm-2 W1-P
0 6.31 1.53×10-6 0.67 101 7.24×10-5 0.41 23537 --- --- ---
2 5.75 4.27×10-5 0.48 3703 1.27×10-5 0.75 50439 --- --- ---
24 19.62 4.80×10-6 0.57 379 4.66×10-5 0.76 130470 --- --- ---
72 20.06 4.34×10-5 0.59 203 8.53×10-5 0.77 164630 --- --- ---
96 19.31 4.34×10-5 0.59 171 9.50×10-5 0.76 274590 --- --- ---
192 13.36 3.04×10-5 0.58 188 8.54×10-5 0.64 3011 2237.31 2.68 ×10-3 0.38
240 16.03 2.58×10-5 0.59 237 9.52×10-5 0.64 3123 31.51 1.80 ×10-4 0.35
336 14.40 1.56×10-5 0.64 362 1.25×10-4 0.62 2361 28.25 1.76 ×10-4 0.32
Table 4  Electrochemical parameters obtained from AC impedance spectra for water-based chromium-freeDacromet coating after immersion for different time
Fig.7  Electrical equivalent circuits for water-based chromium-free Dacromet coating: (a) 0~96 h;(b) 192~336 h
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