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On the electrochemical behaviour of V-N-8Cr weathering steel in simulated industrial atmosphere

机译:关于模拟工业大气中V-N-8CR风化钢的电化学行为

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We have studied here the wet/dry cyclic corrosion behaviour of V-N-0.8Cr weathering steel and compared with a reference steel (Q345B) in 0.01 mol/L NaHSO3 simulated industrial atmosphere. The study indicated that the coherent protective oxide layer formed in the surface of V-N-0.8Cr microalloyed weathering steel, contained corrosion resistant alloying elements (Cr, Ni, Cu, P, Mo). The addition of Cr significantly inhibited the corrosion of weathering steel. The corrosion rate of V-N-0.8Cr and Q345B steel after 360 h corrosion were 1.60 g/(h center dot cm(2)) and 2.42 g/(h center dot cm(2)) respectively. The major corrosion products in both the steels mainly constituted of alpha-FeOOH and gamma- FeOOH and Fe3O4. The stratification of the corrosion layer evolved into a dual-layer structure, where the outer layer was dense and the inner layer was a loose and porous structure in V-N-0.8Cr weathering steel. This is different from previous studies. Cr tends to be concentrated in the inner corrosion layer.
机译:我们在此研究了V-N-0.8CR风化钢的湿/干循环腐蚀行为,并与0.01mol / L NaHSO3的参考钢(Q345B)进行了比较。该研究表明,在V-N-0.8CR微合金化钢的表面形成的相干保护氧化物层,含有耐腐蚀合金元素(Cr,Ni,Cu,P,Mo)。添加CR显着抑制了耐候钢的腐蚀。 360小时腐蚀后V-N-0.8Cr和Q345b钢的腐蚀速率分别为1.60g /(h中心点Cm(2))和2.42g /(h中心点Cm(2))。两种钢中的主要腐蚀产品主要由Alpha-FeOh和Gamma-FeOh和Fe3O4构成。腐蚀层的分层进化成双层结构,其中外层是致密的,内层是V-N-0.8CR风化钢中的松散和多孔结构。这与以往的研究不同。 CR倾向于集中在内腐蚀层中。

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