Acta Metallurgica Sinica (English Letters) >
Corrosion Mechanism of Corrosion-Resistant Steel Developed for Bottom Plate of Cargo Oil Tanks
Received date: 2012-11-30
Revised date: 2013-02-04
Online published: 2013-05-06
Supported by
Fundamental Research Funds for the Central Universities (No.FRF-PT-12-144A) and the National Natural Science Foundation of China (Nos.51171025 and 51271023) and National network of Field Observation & Scientific Research on Material Environmental Corrosion.
A new type of corrosion-resistant steel consisting of ferrite and bainite phases was developed for cargo oil tanks of crude oil tankers. The corrosion rate of this new steel was 0.22 mm/a, which was equivalent to ca. 1/5 of the criterion(≤1 mm/a) for corrosion-resistant steels. The composition and element distribution of the corrosion products were investigated by micro-Raman spectrometry and energy dispersive spectrometer. The results demonstrated that the corrosion product wascomposed of α-FeOOH, Fe3O4 and a continuous Cu enrichment layer. This kind of corrosion product was protective to the steel matrix and accounted for the enhancement of the corrosion resistance of the new developed steel.
Key words: Alloying elements; Corrosion; Low alloy steel; Raman spectroscopy; SEM
Feilong SUN , Xiaogang LI , Fan ZHANG , Xuequn CHENG , Cheng ZHOU , Nianchun WU , Yuqun YIN , Jinbin ZHAO . Corrosion Mechanism of Corrosion-Resistant Steel Developed for Bottom Plate of Cargo Oil Tanks[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(3) : 257 -264 . DOI: 10.1007/s40195-012-0231-0
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