Corrosion and Cavitation Erosion Behaviors of Two Marine Propeller Materials in Clean and Sulfide-Polluted 3.5% NaCl Solutions

doi:10.1007/s40195-017-0602-7

Abstract

Abstract:

The corrosion and cavitation erosion behaviors of two main materials for ship propellers, i.e., nickel-aluminum bronze (NAB) and manganese-nickel-aluminum bronze (MAB) were investigated in a clean and sulfide-polluted 3.5% NaCl solutions. The presence of sulfide increased the corrosion damage of both NAB and MAB by rendering the corrosion product film thicker, more porous and less protective. For MAB, the formation of Fe oxides/sulfides within the corrosion product film may reduce the film compactness and responsible for the lower corrosion resistance, compared with NAB. The presence of sulfide caused the occurrence of more severe corrosion on the surface and therefore further enhanced the cavitation erosion damage. Compared with the result in the clean solution, the cavitation-erosion mass loss rate was raised by a factor of about 11.88% for MAB, and 58.6% for NAB. For NAB, the mechanical erosion dominated the damage in the clean solution, while the cavitation erosion synergy made a significant contribution to the overall damage in the sulfide-polluted solution. For MAB, it was the mechanical damage that contributed mainly to the cavitation erosion damage in both solutions. The exfoliation of large-sized κ phase and the cleavage rupture of β phases resulted in lower cavitation erosion resistance of MAB, compared with NAB.

Key words: Copper alloy, Cavitation erosion, Corrosion, Sulfide

Qi-Ning Song, Nan Xu Ye-Feng, BaoEmail author, Yong-Feng Jiang, Wei Gu, Yu-Gui Zheng, Yan-Xin Qiao. Corrosion and Cavitation Erosion Behaviors of Two Marine Propeller Materials in Clean and Sulfide-Polluted 3.5% NaCl Solutions[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(8): 712-720.

Figures/Tables 11

Table 1 Chemical composition of the as-cast MAB and NAB

Element (wt%)	Al	Ni	Fe	Mn	Cu
MAB	7.28	2.10	3.62	12.35	Bal.
NAB	9.30	4.50	4.88	0.97	Bal.

Fig. 1 Optical microstructures of the cast NAB and MAB

Fig. 2 Mass loss and film weight results of the cast NAB and MAB after immersion in clean and sulfide-polluted 3.5% NaCl solutions for 10 days

Fig. 3 Surface morphologies of the cast NAB and MAB after immersion in a, b clean; c, d sulfide-polluted 3.5% NaCl solutions for 10 days: a, c for NAB; b, d for MAB

Fig. 4 Backscattered electron (BSE) images in the cross section of the cast NAB and MAB after immersion in a, b clean, c, d sulfide-polluted 3.5% NaCl solutions for 10 days: a, c for NAB; b, d for MAB

Table 2 Composition results of the corrosion products located on different areas in Fig. 4

Element (wt%)	O	Al	Ni	Fe	Mn	Cu	Cl	S
Areas
1	23.08	8.75	7.46	5.52	-	54.55	0.65	-
2	40.20	1.61	1.55	49.76	2.79	4.08	-	-
3	30.64	4.47	1.90	9.89	7.57	45.53	-	-
4	33.55	6.27	10.55	2.19	-	41.22	0.52	5.69
5	18.93	8.18	4.08	4.35	-	61.26	0.59	2.61
6	41.90	3.22	1.07	34.95	4.16	13.07	-	1.62
7	16.28	5.04	0.63	5.70	9.45	61.32	-	1.58

Fig. 5 Cumulative mass loss as a function of cavitation erosion time for the cast NAB and MAB in clean and sulfide-polluted 3.5% NaCl solutions

Table 3 Mass loss results for the cast NAB and MAB in clean and sulfide-polluted 3.5% NaCl solutions

Material/solution	Mass loss rate (mg cm^-2 h^-1)					Percentages (%)
Material/solution	T	E	C	E + C	S	E/T	S/T
NAB/clean	1.3750	0.9912	0.0017	0.9929	0.3821	72.09	27.79
NAB/sulfide	2.1808	0.9912	0.0054	0.9966	1.1842	45.45	54.30
MAB/clean	2.6167	1.7225	0.0034	1.7259	0.8908	65.83	34.04
MAB/sulfide	2.9275	1.7225	0.0066	1.7291	1.1984	58.84	40.94

Fig. 6 Surface morphologies of the cast NAB after cavitation erosion in a, b clean, c, d sulfide-polluted 3.5% NaCl solutions for different time: a, c 1 h; b, d 3 h

Fig. 7 Surface morphologies of the cast MAB after cavitation erosion in a, b clean, c, d sulfide-polluted 3.5% NaCl solution for different time: a, c 1 h; b, d 3 h

Fig. 8 Surface morphologies after cavitation erosion in a, c clean; b, d sulfide-polluted 3.5% NaCl solution for 10 h: a, b for the cast MAB; c, d for the cast NAB

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