FORMATION OF A GRADIENT NANOSTRUCTURED SURFACE LAYER ON A MARTENSITIC STAINLESS STEEL AND ITS EFFECTS ON THE ELECTRO- CHEMICAL CORROSION BEHAVIOR

doi:10.11900/0412.1961.2014.00556

Acta Metall Sin

2015, Vol. 51

Issue (5): 513-518 DOI: 10.11900/0412.1961.2014.00556

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FORMATION OF A GRADIENT NANOSTRUCTURED SURFACE LAYER ON A MARTENSITIC STAINLESS STEEL AND ITS EFFECTS ON THE ELECTRO- CHEMICAL CORROSION BEHAVIOR

Haiwei HUANG¹,Zhenbo WANG¹(

),Li LIU²,Xingping YONG³,Ke LU^1,⁴

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
3 Shenyang Blower Works Group Co. Ltd., Shenyang 110869
4 Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094

Cite this article:

Haiwei HUANG, Zhenbo WANG, Li LIU, Xingping YONG, Ke LU. FORMATION OF A GRADIENT NANOSTRUCTURED SURFACE LAYER ON A MARTENSITIC STAINLESS STEEL AND ITS EFFECTS ON THE ELECTRO- CHEMICAL CORROSION BEHAVIOR. Acta Metall Sin, 2015, 51(5): 513-518.

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Abstract

A gradient nanostructured (GNS) surface layer was fabricated on a Z5CND16-4 martensitic stainless steel by means of surface mechanical rolling treatment (SMRT). The microstructure in the GNS surface layer was characterized by using SEM and TEM. The results showed that the mean grain size increases with depth, from about 25 nm at the topmost surface layer to the initial value in the matrix. The total thickness of the grain-refined layer is about 150 mm. The electrochemical corrosion property of the SMRT sample was compared with that of the as-received sample in a 3.5%NaCl aqueous solution. It is shown that the pitting corrosion potential increases from about 0.179 V in the as-received sample to about 0.313 V in the SMRT sample, and the self-corrosion potential also increases evidently. The formation of nanostructures, the increased structural homogeneity, and the introduction of compressive residual stresses in the GNS surface layer, as well as the decreased surface roughness, were discussed to promote the pitting corrosion resistance of the SMRT sample.

Key words: nanostructured material gradient nanostructure surface mechanical rolling treatment martensitic stainless steel pitting corrosion

Received: 10 October 2014

Fund: National Basic Research Program of China (No.2012CB932201)

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	Haiwei HUANG
	Zhenbo WANG
	Li LIU
	Xingping YONG
	Ke LU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00556 OR https://www.ams.org.cn/EN/Y2015/V51/I5/513

Fig.1 SEM image of the as-received Z5CND16-4 stainless steel sample

Fig.2 Cross-sectional SEM image of the Z5CND16-4 stainless steel sample after surface mechanical rolling treatment (SMRT)

Fig.3 TEM images of the SMRT surface layer at different depths

Fig.4 Statistical distribution of grain size of the topmost surface layer

Fig.5 Distributions of residual stresses along depth in the SMRT surface layer

Fig.6 Potentiodynamic polarization curves of the SMRT and the as-received samples in 3.5%NaCl aqueous solution

Fig.7 SEM images of pits after corrosion on the as-received sample (a) and the SMRT sample (b) (d ferrite and martensite are pointed by A and B, respectively)

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