Corrosion behavior of copper T2 and brass H62 in simulated Nansha marine atmosphere

doi:10.1016/j.jmst.2019.04.024

Abstract

Abstract:

The accelerated corrosion behavior of copper T2 and brass H62 exposed in simulated Nansha marine atmosphere for different periods were investigated by weight loss method, SEM, XRD and potentiodynamic polarization measurements. The results indicate that copper T2 and brass H62 underwent severe corrosion, and the final corrosion rates at 32 days of exposure were 0.24μm/d and 0.10μm/d, respectively. Moreover, the overall corrosion type of copper T2 was uniform and the corrosion products Cu₂O and Cu₂Cl(OH)₃ played a vital role in the corrosion rate of copper. While the dezincification corrosion with zinc preferential dissolution was obvious in brass H62. The predominant phases were the zinc-rich compounds Zn₅(OH)₈Cl₂·H₂O, Zn₁₂(SO₄)₃Cl₃(OH)₁₅·5H₂O and NaZn₄(SO₄)Cl(OH)₆·6H₂O. There existed a large number of copper-rich holes with 20-50μm depth beneath the corrosion product layer.

Key words: Copper, Brass, Weight loss, Nansha, Atmospheric corrosion

Xiao Lu, Yuwei Liu, Miaoran Liu, Zhenyao Wang. Corrosion behavior of copper T2 and brass H62 in simulated Nansha marine atmosphere[J]. J. Mater. Sci. Technol., 2019, 35(9): 1831-1839.

Figures/Tables 11

Table 1 The main composition of seawater in Nansha.

Ion species	Cl^-	SO₄^2-	HCO₃^-	CO₃^2-	Na⁺	K⁺	Mg²⁺	Ca²⁺
Density(g/L)	20	2.18	0.14	0.014	10	5	1	0.3

Fig. 1. Corrosion rate of copper T2 and brass H62 exposed in simulated Nansha marine atmosphere as a function of the exposure time.

Fig. 2. XRD patterns of copper T2 and brass H62 exposed for different times: (a) copper T2; (b) brass H62.

Fig. 3. Surface morphology and the corresponding EDS spectra of corrosion products formed on copper T2 exposed for different times: (a) 2d, (b) 4d, (c) 8d, (d) 22d, (e) 32d, (f) an enlarged view of figure (c).

Table 2 EDS results of the chemical composition (wt. %) of region A and B on the copper surface exposed for 8d.

Element	O	Cl	Cu	Mg	S	K	Ca
A	9.21	12.36	70.76	2.29	2.9	0.65	1.92
B	6.44	3.76	87.72	1.29	0.8	-	-

Fig. 4. Cross-section morphology and element distribution maps of copper T2 exposed for 32 days.

Fig. 5. Surface morphology of copper T2 after removing corrosion products at different exposure times: (a) 2d, (b) 4d, (c) 8d, (d) 14d, (e) 22d, (f) 32d.

Fig. 6. Surface morphology and the corresponding EDS spectrum of corrosion products formed on brass H62 exposed for different times: (a) 2d, (b) 4d, (c) 8d, (d) 22d, (e) 32d, (f) a larger version of figure (e).

Fig. 7. Cross-section morphology and element distribution maps of brass H62 exposed for 32 days.

Fig. 8. Surface morphology of brass H62 after removing corrosion products at different exposure times: (a) 2d, (b) 4d, (c) 8d, (d) 14d, (e) 22d, (f) 32d.

Fig. 9. Polarization curves of copper T2 and brass H62 exposed for different time: (a) copper T2; (b) brass H62.

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