Correlation Between Microstructure and Corrosion Behavior of Two 90Cu10Ni Alloy Tubes

doi:10.1007/s40195-014-0111-x

Abstract

Abstract:

Two kinds of 90Cu10Ni tubes with different service lives (more than 3 years and only 1 year, respectively) under identical working conditions were studied by an immersion test in a 3.5 wt% NaCl solution and the electron backscattered diffraction (EBSD) technique. The morphology after immersion showed severer corrosion attack at the grain boundaries of the tube with shorter service life compared with the tube with longer service life. The grain boundary characterization distributions (GBCDs) of the two tubes obtained by EBSD revealed more Σ3 boundaries and twins, and larger random boundary meshes in the tube with longer service life. A short immersion test in a modified Livingston’s solution was conducted to evaluate the tendency to corrosion attack of different types of the grain boundaries. SEM and AFM were used to characterize the corrosion morphologies of the boundaries. A strong correlation between varying depths of corrosion grooves and types of the grain boundaries was obtained. The influence of deviation angle of low Σ boundaries on corrosion resistance of the grain boundaries was also discussed. It is concluded that a special “grain boundary engineering” (GBE) treatment has been performed on the tube with longer service life. It is proposed that the optimized GBCD is responsible for the better service performance of the tube.

Key words: 90Cu10Ni alloy, Corrosion resistance, Grain boundary, Twin, Σ3 boundary, Electron backscattered diffraction

Aili Ma, Shengli Jiang, Yugui Zheng, Zhiming Yao, Wei Ke, Shuang Xia. Correlation Between Microstructure and Corrosion Behavior of Two 90Cu10Ni Alloy Tubes[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 730-738.

Figures/Tables 11

Table 1 Chemical compositions of the experimental 90Cu10Ni alloy tubes (in wt%)

Material	Ni	Fe	Mn	C	Pb	S	P	Zn	Cu
Tube A	10.4	1.73	0.68	0.014–0.027	<0.001	0.004	0.003	<0.01	Bal.
Tube B	10.4	1.51	0.59	0.009	<0.001	0.002	0.002	<0.01	Bal.

Fig. 1 Optical micrographs showing the grain size and twin distribution on cross sections of Tube A a and Tube B b

Fig. 2 Unique grain color maps on cross sections of Tube A a and Tube B b

Fig. 3 Grain size distributions in Tube A and Tube B

Fig. 4 SEM images of the surfaces of Tube A a, b and Tube B c, d after immersion in 3.5 wt% NaCl solution for 7 days a, c and 10 days b, d

Fig. 5 Grain boundary characterization distribution maps (Brandon criterion) for cross section samples of Tube A a and Tube B b

Table 2 Grain boundary character distribution statistics of Tube A and Tube B

Material	Σ1	Σ3	{111}-Σ3	Σ9	Σ27	Total Σ3ⁿ(n = 1,2,3)
Material	(%)	(%)	(%)	(%)	(%)	(%)
Tube A	10.5	45.3	5.1	2.7	0.6	48.6
Tube B	3.2	57.9	14.3	4.8	2.5	65.2

Fig. 6 Length fractions of Σ3n boundaries (up to n = 3) on the cross sections of Tube A and Tube B

Fig. 7 SEM images of corrosive attack on the boundaries of Tube A a and Tube B b samples exposed to Livingston’s solution for 1.5 h and GBCD maps c, d of the areas in a, b

Fig. 8 a SEM images of corrosive attack on the boundaries of Tube B exposed to Livingston’s solution for 1.5 h; b AFM morphology of the area in a after a total immersion period of 2.5 h; c, d, e the three section profiles denoted in b

Fig. 9 The proportions of Σ3 boundaries in Tube A and Tube B with different angular deviations: a in total Σ3 boundaries, b in all grain boundaries

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