Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel

doi:10.11901/1005.3093.2013.700

Chinese Journal of Materials Research

2014, Vol. 28

Issue (1): 67-74 DOI: 10.11901/1005.3093.2013.700

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Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel

Lei ZHANG¹,Sujun WU^1,^*(

),Guojin SUN²,Qingshen MA³

1. School of Materials Science and Engineering, Beihang University, Beijing 100191
2. Ningbo Branch of China Ordnance Science Research Institute, Ningbo 315000
3. Shougang Technology Research Institute, Beijing 100041

Cite this article:

Lei ZHANG,Sujun WU,Guojin SUN,Qingshen MA. Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel. Chinese Journal of Materials Research, 2014, 28(1): 67-74.

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Abstract

The surface grain boundary distribution characteristics and microtopography of hot rolled and heat treated 10CrNi5Mo high strength steel were tested by EBSD technology and AFM. The corrosion behavior of 10CrNi5Mo high strength steel was investigated by full immersion tests and electrochemical impedance spectroscopy (EIS) in simulated seawater environment. The results show that there is higher proportion of low angle grain boundaries on the surface of hot rolled 10CrNi5Mo high strength steel than that of the heat treated specimen. The corrosion of the heat treated specimen is more uniform and the roughness is less than that of the hot rolled specimen after nital corrosion. In the full immersion tests in simulated seawater environment, the hot rolled 10CrNi5Mo high strength steel presents a better corrosion resistance. The impedance increased in the mid-stage of immersion tests. The integration of corrosion products on the surface and matrix metal is closer so that the corrosion products can prevent the electrochemical reaction between the matrix metal and solution.

Key words: materials failure and protection high strength steel AFM electrochemical impedance spectroscopy (EIS)

Received: 24 September 2013

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	Lei ZHANG
	Sujun WU
	Guojin SUN
	Qingshen MA

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.700 OR https://www.cjmr.org/EN/Y2014/V28/I1/67

Table 1 Nominal composition of 10CrNi5Mo high strength steel (mass fraction, %)

Fig.1 AFM images of hot rolled (a, c) and heat treated (b, d) specimen after 10 s nital corrosion

Fig.2 Surface roughness of different status of specimen after 10 s nital corrosion

Fig.3 EBSD microstructure and misorientation distribution on the specimen surface after hot rolled (a, c) and heat treated (b, d) respectively

Fig.4 Open circuit potential curves of different status of hot rolled specimen 1# and heat treated specimen 2# in 3.5%NaCl solution

Fig.5 Electrochemical impedance spectroscopy of different status of specimen in 3.5%NaCl solution, (a) hot rolled specimen, (b)heat treated specimen, (c) and (d) were the partial enlarged details of (a) and (b) respectively

Fig.6 Simulated equivalent circuit of EIS test

Table 2 Electrochemical impedance parameters of 10CrNi5Mo high strength steel in 3.5%NaCl solution after hot rolled and heat treated treatment

Fig.7 Evolution of C_dl (a), R_t (b) with immersion time of hot rolled specimen 1# and heat treated specimen 2#

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