Galvanic Effect Between Galvanized Steel and Carbon Fiber Reinforced Polymers

doi:10.1007/s40195-017-0539-x

Abstract

Abstract:

The galvanic corrosion behavior of carbon fiber reinforced polymers (CFRPs) GM-CFRP and Tepex-CFRP in contact with a Zn-coated DP590 steel in solution containing 0.9 wt% NaCl + 0.1 wt% CaCl₂ + 0.075 wt% NaHCO₃ was investigated. The results showed that the GM-CFRP/steel couple was initially more resistant to galvanic corrosion, but its galvanic corrosion activity gradually became higher than the Tepex-CFRP/steel couple. The different galvanic behaviors of these two couples were discussed based on the electrochemical performance of GM-CFRP, Tepex-CFRP and DP590 coupons in the testing solution.

Key words: Carbon fiber reinforced polymer (CFRP), Composite, Carbon fiber, Steel, Galvanic effect

Chi Zhang, Da-Jiang Zheng, Guang-Ling Song. Galvanic Effect Between Galvanized Steel and Carbon Fiber Reinforced Polymers[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(4): 342-351.

Figures/Tables 19

Table 1 Compositions of test materials

Sample	Component
DP590	Fe (Bal.), C (0.095 wt%), Cr (0.03 wt%), Ni (0.035 wt%), Si (0.31 wt%); Mn (1.75 wt%), Ti (<0.002 wt%), P (0.011 wt%), S (0.005 wt%)
GM-CFRP	Made at GM R&D (50 wt% carbon fiber)
Tepex-CFRP	Bond Laminates TEPEX Dynalite 201-C200(6)/45 vol% [45 vol% carbon fiber in nylon 6, 6 (200 g/m² fabric, 6 layers)]

Fig. 1 Schematic illustration of bulk resistance measurement with a constant current (0.2 A) applied to the bolts in the outer holes. The distances between the inner holes used for voltage drop measurement are 2, 4 and 6 cm, respectively

Fig. 2 Schematic illustration of the electrolyte cell setup for open-circuit potential, EIS and polarization curve measurements. The electrolyte volume in the cell is 100 ml

Fig. 3 Schematic illustration of the setup for galvanic current measurement. The electrolyte volume in cell is 100 ml

Fig. 4 Macroscopic morphologies of CFRP samples

Fig. 5 Surfaces of GM-CFRP sample before a, after b surface grinding

Fig. 6 Surfaces of Tepex-CFRP sample before a, after b surface grinding

Fig. 7 Cross-sectional images of a GM-CFRP sample

Fig. 8 Cross-sectional images of a Tepex-CFRP sample

Fig. 9 Bulk resistances for the CFRP samples before and after surface grinding

Fig. 10 Repeatedly measured EISs of CFRP samples: a GM-CFRP, b Tepex-CFRP

Fig. 11 Equivalent circuit for simulating the measured EISs shown in Fig. 10

Table 2 Surface resistance (R) of CFRPs

Sample	GM-CFRP (Ω/cm^-2)	Tepex-CFRP (Ω/cm^-2)
1	1.22 × 10⁵	6.41 × 10⁴
2	5.69 × 10⁷	4.02 × 10⁴
3	4.81 × 10⁶	2.03 × 10⁴
Average	2.06 × 10⁷	4.15 × 10⁴

Fig. 12 Variation of EIS with immersion time for CFRPs under a polarizing voltage of -1 V/Ag/AgCl: a GM-CFRP sample, b Tepex-CFRP sample

Fig. 13 OCPs of DP590 steel, GM-CFRP and Tepex-CFRP samples versus immersion time

Fig. 14 Polarization curves of different samples

Fig. 15 Galvanic current densities of CFRP/steel couples: a GM-CFRP/steel, b Tepex-CFRP/steel

Fig. 16 Galvanic corrosion damage of DP590 steel coupled with a Tepex-CFRP and b GM-CFRP after 8 h of galvanic current measurements

Fig. 17 Schematic illustration of different surface layers of a GM-CFRP, b Tepex-CFRP

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