V_2O_5 および V_2O_5-Na_2SO_4 混合融液による鋼の腐食に及ぼすクロム, 珪素の影響

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In order to make clear the effects of alloying elements, especially chromium and silicon, on the corrosion of steels by V_2O_5 and V_2O_5-Na_2SO_4 mixtures, the corrosion resistance of Cr steels, Cr-Ni steels, Cr-Si steel and Cr-Ni-Si steel was examined by weight loss, metallography, X-ray diffraction and electron beam X-ray microanalysis. The main results obtained are as follows : 1. The corrosion resistance of the steels against molten V_2O_5 at 850℃ was increased by the addition of more than 18% Cr, but less improved by the addition of 12% Cr. This was explained to be due to the differences in properties and constitutions of the scales. The corrosion resistance of Cr steels was increased by the addition of 3% Si. This effect was considered to be due to the formation of SiO_2 layers in the scales. The enrichment of Ni was observed at the base metal-scale interface of corroded 18% Cr-8% Ni steel, which showed a fairly good corrosion resistance. The existence of Cr_xFe_<1-x>VO_4 solid solution in Fe_2O_3-Cr_2O_3-V_2O_5 ternary system was suggested by X-ray diffraction. This solid solution was found in the corrosion products of Cr-Si steels and 18% Cr-8% Ni steel. 2. The corrosion resistance of steels against molten V_2O_5-Na_2SO_4 mixture (10 : 1 by weight ratio) at 850℃ was less improved by the addition of 18∿21% Cr, but increased by the addition of about 60% Cr. The resistance of Cr steels was improved by the addition of about 3% Si. The effect was considered to be due to the formation of SiO_2 layers in the scales. 8% Cr-3% Si steel, which showed a fairly good resistance against the molten mixtures containing 0∿30 mol% Na_2SO_4, showed less resistance against the mixtures more than 40 mol% Na_2SO_4. This difference was considered to be due to the lack of protective SiO_2 layers.
社団法人日本鉄鋼協会の論文
1970-04-01

V_2O_5 および V_2O_5-Na_2SO_4 混合融液による鋼の腐食に及ぼすクロム, 珪素の影響

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