INFLUENCE OF MICROSTRUCTURE OF AH32 CORROSION RESISTANT STEEL ON CORROSION BEHAVIOR

doi:10.3724/SP.J.1037.2012.00105

Acta Metall Sin

2012, Vol. 48

Issue (5): 534-540 DOI: 10.3724/SP.J.1037.2012.00105

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INFLUENCE OF MICROSTRUCTURE OF AH32 CORROSION RESISTANT STEEL ON CORROSION BEHAVIOR

HAO Xuehui¹, DONG Junhua¹, WEI Jie¹, KE Wei¹, WANG Changgang¹,XU Xiaolian², YE Qibin²

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Technology Center of Angang Steel Co., Ltd., Anshan 114009

Cite this article:

HAO Xuehui, DONG Junhua, WEI Jie, KE Wei, WANG Changgang,XU Xiaolian, YE Qibin. INFLUENCE OF MICROSTRUCTURE OF AH32 CORROSION RESISTANT STEEL ON CORROSION BEHAVIOR. Acta Metall Sin, 2012, 48(5): 534-540.

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Abstract International martime organization (IMO) has approvedand considered corrosion resistant steel as the only alternative for anti-corrosion coating since May 2010. The implementation of the standard will have a profound impact on ship building, steel, shipping and other industries. At present, Japan has a relatively mature technology, South Korea has completed the pre-development work, while China has only carried out some preliminary studies. If the technology is blocked, a large number of steel needs to be imported which would push up the cost of construction of the shipbuilding industry, and has a direct impact on the orders of shipping enterprises. The amount of steel for cargo oil tank in China is more than two million tons each year, and therefore, the localization of research and application of corrosion resistant steel for cargo oil tanks has become an urgent task. The impact of microstructure of the existing shipbuilding steel on corrosion behavior in simulated corrosion environment is studied based on the standard in this paper to develop our own corrosion resistant steel. According to the standard, immersion test was used to measure the corrosion process of AH32 corrosion resistant steel in the bottom simulated environment of cargo oil tanks. Using gravimetric measurement, electrochemical polarization and impedance methods, scanning electron microscopy and electron probe et al, the influence of microstructure of AH32 corrosion resistant steel on its corrosion behaviors was analysed. The experimental results showed that: during the test simulating the corrosion of the bottom plate of cargo oil tanks, corrosion rate of the rolling surface of AH32 corrosion resistant steel was low with small area fraction of pearlite, corrosion rate of the cross section was fast due to the big area fraction of pearlite, and both corrosion rate increased with the immersion time. In addition, there were uniform corrosion and the pits formed by dissolved inclusions in rolling surface, and corrosion of the cross-section was selected along the banded pearlite. The carbon enriched in pearlite area of the sample after immersion, which caused corrosion rate increased with the immersion time.

Key words: AH32 corrosion resistant steel immersion test microstructure corrosion behavior

Received: 27 February 2012

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