Seawater Corrosion Behavior of New 70-1 Tin Brass Net in Waters off Dachen Island for Two Years

doi:10.11902/1005.4537.2017.206

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 594-600 DOI: 10.11902/1005.4537.2017.206

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Seawater Corrosion Behavior of New 70-1 Tin Brass Net in Waters off Dachen Island for Two Years

Bobo HUANG¹,Ping LIU¹(

),Xinkuan LIU¹,Pinxiu MEI²,Xiaohong CHEN¹

1. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Shanghai Yong-ling Alloy Material Co. Ltd., Shanghai 201802, China

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Abstract

In recent years, sea cage culture is being carried out in the country, the very cage generally is enveloped with copper alloy net therefore, it is of significance to acquire the corrosion performance of the Cu-alloy net in seawater. In the article, the seawater exposure of a new type of 70-1 tin brass net was carried out for two years in the waters off Dachen Island of Zhejiang province. Then the corroded material was characterized by means of chemical analysis, macro- and micro-morphology observation, XRD, SEM with EDSetc. It was found that several distinct corrosion zones can be differentiated on the net along the vertical direction while the corrosion behavior of the net in each corrosion zone is significantly different. Cu-alloy suffered from serious local corrosion, pitting corrosion and dezincification in the tidal zone, but slight corrosion in the full immersion zone due to the presence of a corrosion product film. Besides, a typical erosion zone can be observed in that maritime environment, the Cu-alloy net suffered from serious erosion- and dealloying-corrosion.

Key words: new 70-1 tin brass net cage made of copper alloy marine corrosion zone corrosion behavior pitting dealloying corrosion product layer

Received: 02 December 2017

ZTFLH:

TG146.1

Fund: Supported by Shanghai Alliance Program

Corresponding Authors: Ping LIU E-mail: liuping@usst.edu.cn

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	Xinkuan LIU
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Cite this article:

Bobo HUANG,Ping LIU,Xinkuan LIU,Pinxiu MEI,Xiaohong CHEN. Seawater Corrosion Behavior of New 70-1 Tin Brass Net in Waters off Dachen Island for Two Years. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 594-600.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.206 OR https://www.jcscp.org/EN/Y2018/V38/I6/594

Fig.1 Variation of the diameter of 70-1 tin brass wire with seawater depth after practical application for 2 a

Table 1 Main chemical compositions of HSn70-1 copper alloy wire after corrosion for 2 a in three seawater zones

Fig.2 Cross-sectional microstructures of HSn70-1 copper alloy wire after corrosion for 2 a in tidal (a), immersion (b) and erosion (c) zones

Fig.3 XRD patterns of HSn70-1 copper alloy wire after corrosion for 2 a in three seawater zones

Fig.4 Surface macroscopic morphologies of HSn70-1 copper alloy wire after corrosion for 2 a in tidal (a), immersion (b) and erosion (c) zones

Fig.5 Microscopic morphologies of cross-sectional edge of HSn70-1 copper alloy wire after corrosion for 2 a in tidal (a), immersion (b) and erosion (c) zones

Fig.6 EDS line scannings of main elements at cross-section edge of HSn70-1 copper alloy wire after corrosion in tidal (a), immersion (b) and erosion (c) zones

Fig.7 EDS results of corrosion products formed on HSn70-1 copper alloy wire after corrosion in tidal (a), immersion (b) and erosion (c) zones

Table 2 EDS analysis results of corrosion products formed on HSn70-1 copper alloy wire after immersion in three seawater zones

Fig.8 XRD spectrum of corrosion products of HSn70-1 copper alloy wire after immersion in tidal zone

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