A Comparative Assessment on Cavitation Erosion Behavior of Typical Copper Alloys Used for Ship Propeller

doi:10.11902/1005.4537.2020.185

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 639-645 DOI: 10.11902/1005.4537.2020.185

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A Comparative Assessment on Cavitation Erosion Behavior of Typical Copper Alloys Used for Ship Propeller

TONG Yao¹^,², SONG Qining¹^,²(

), LI Huilin², XU Nan², BAO Yefeng², ZHANG Genyuan², ZHAO Lijuan²

^1.Engineering Research Center of Dredging Technology of Education, Hohai University, Changzhou 213022, China
^2.College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China

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Abstract

The cavitation corrosion behavior of three typical copper alloys for making marine propeller, namely manganese-brass (Mn-brass), manganese-aluminum-bronze (MAB) and nickel-aluminum-bronze (NAB) in 3.5%NaCl solution were comparatively assessed. The cavitation erosion mass loss, electrochemical process, the synergy between cavitation erosion and corrosion, and the morphology of the eroded surface were characterized. The results showed that the cavitation erosion resistance of the three alloys may be ranked as flows: NAB＞MAB＞Mn-brass. After cavitation erosion for 5 h, the mass loss of Mn-brass was 3.07 and 4.06 times that of MAB and NAB, respectively. Under the action of cavitation erosion, the α phase of NAB and MAB underwent plastic deformation, meanwhile cracks first emerged at boundaries of α/κ phase. In addition, cleavage fracture occurred in the β matrix in MAB. However, for Mn-brass, severe plastic deformation and cleavage fracture cracking occurred in the α matrix, and the cavitation damage was much more serious. The electrochemical results showed that under the action of cavitation erosion the free corrosion potential of Mn-brass and MAB shifted to a more positively value, in the contrary, a negative value for NAB. Due to the action of cavitation erosion, the free corrosion current density increased by an order of magnitude for the three copper alloys. The assessment of cavitation erosion-corrosion synergy revealed that the cavitation erosion mechanism of the three materials was dominated by mechanical damage. The synergistic interaction of cavitation erosion-corrosion was mainly caused by cavitation erosion promoted by corrosion.

Key words: ship propeller copper alloy cavitation erosion synergy

Received: 09 October 2020

ZTFLH:

TG174

Fund: Fundamental Research Funds for the Central Universities of China(B210202129);Natural Science Foundation of Jiangsu Province(BK20191161);National Natural Science Foundation of China(51601058)

Corresponding Authors: SONG Qining E-mail: qnsong@hhu.edu.cn

About author: SONG Qining, E-mail: qnsong@hhu.edu.cn

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Cite this article:

TONG Yao, SONG Qining, LI Huilin, XU Nan, BAO Yefeng, ZHANG Genyuan, ZHAO Lijuan. A Comparative Assessment on Cavitation Erosion Behavior of Typical Copper Alloys Used for Ship Propeller. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 639-645.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.185 OR https://www.jcscp.org/EN/Y2021/V41/I5/639

Table 1 Chemical compositions of three test copper alloys (mass fraction / %)

Fig.1 Optical microstructures of Mn-brass (a), MAB (b) and NAB (c, d)

Fig.2 Mass losses (a) and mass loss rats (b) of three copper alloys during cavitation erosion test

Fig.3 Open circuit potentials of three copper alloys under the alternate condition of quiescence and cavitation erosion

Fig.4 Polarization curves of three copper alloys under the quiescence and cavitation erosion conditions

Table 2 Current densities and corrosion potentials of three copper alloys under the quiescence and cavitation erosion conditions

Table 3 Analysis results of cavitation erosion-corrosion synergistic effect for three copper alloys in 3.5%NaCl solution

Fig.5 Surface morphologies of Mn-brass (a), MAB (b) and NAB (c) after cavitation erosion in 3.5%NaCl solution for 1 h (a1~c1) and 5 h (a2~c2)

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