Effect of Crevice Corrosion on the Degradation Rate ofFe-30Mn-1C Alloy

doi:10.11900/0412.1961.2017.00451

Acta Metall Sin

2018, Vol. 54

Issue (7): 1010-1018 DOI: 10.11900/0412.1961.2017.00451

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Effect of Crevice Corrosion on the Degradation Rate ofFe-30Mn-1C Alloy

Zheng MA, Xi LU, Ming GAO, Lili TAN(

), Ke YANG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Zheng MA, Xi LU, Ming GAO, Lili TAN, Ke YANG. Effect of Crevice Corrosion on the Degradation Rate ofFe-30Mn-1C Alloy. Acta Metall Sin, 2018, 54(7): 1010-1018.

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Abstract

Fe-30Mn-1C alloy has great potential to become degradable cardiovascular stent material due to its degradability, excellent comprehensive mechanical properties and biocompatibility. In this work, in order to improve the degradation rate of Fe-30Mn-1C alloy, laser technology was used to process pores with different pore diameters on the samples, and the design of the scaffold was combined with crevice corrosion. The degradation behavior of the alloy was studied through in vitro soaking weight loss experiments and electrochemical tests. The results showed that crevice corrosion can increase the degradation rate of Fe-30Mn-1C alloy significantly.

Key words: iron-based alloy biodegradable crevice corrosion cardiovascular stent

Received: 27 October 2017

ZTFLH:

R318.08

Fund: Supported by National Basic Research Program of China (Nos.2012CB619101 and 2012CB619102) and National High Technology Research and Development Program of China (No.2015AA033701)

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	Zheng MA
	Xi LU
	Ming GAO
	Lili TAN
	Ke YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00451 OR https://www.ams.org.cn/EN/Y2018/V54/I7/1010

Fig.1 Schematic of Fe-30Mn-1C alloy with pore structure (unit: mm)

Fig.2 Degradation rates of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution

Fig.3 Degradation increasing rates of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution

Fig.4 Macro-images of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution (pore size (mm): S0~S4: 0, 0.07, 0.10, 0.15; immersion time (d): T1~T3: 7, 30, 60)

Fig.5 SEM corrosion morphologies of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution before pickling (The insets show the local enlarged images of the pores)

Fig.6 SEM corrosion morphologies of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution after pickling (The insets show the local enlarged images of the apertures)

Fig.7 Elements EDS analyses on the deposition layer of Fe-30Mn-1C alloy immersed in Hank’s solution (The inset shows the corrosion morphology and product)

Fig.8 Cross-sectional morphology and elements EDS analyses on the cross section of Fe-30Mn-1C alloy with pore structure after immersion (The arrows show the corrosion areas)

Fig.9 Cross-sectional morphologies of Fe-30Mn-1C alloy with different sizes of pores immersed in Hank’s solution (T0: 0 d; the insets show the local enlarged images of the apertures)

Table 1 Surface areas of Fe-30Mn-1C alloys with different-size pores

Fig.10 Schematic of degradation mechanism of Fe-30Mn-1C alloys with pore structure during immersion (D—diameter of pore)

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