日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 10 (1968),
pp. 954-959

Effect of Alloying Elements on the Corrosion of Low-Alloy Steels in Sulfuric Acid

Akira Teramae1, Satoshi Kado1, Yasuo Otoguro1 and Riichi Todoroki1

1Central Research Laboratories, Fuji Iron and Steel Co.Ltd., Sagamihara

Abstract:

In an attempt to develop the better effective low-alloy steel to the sulfur dewpoint corrosion in flue gases, an investigation was made in which the effects of alloying elements on the corrosion rate in 40% sulfuric acid at 60°C were studied. Since the superior effect of copper (0.1%) in steel had already been recognized, these effects of alloying elements were investigated in the presence of copper.
According to the results of weight-loss tests with 4-hour immersion in the same solution as mentioned before, the effects of alloying elements may be classified as follows:
(1) more effective: Sb, Se, As (antimony was most effective),
(2) slightly effective: Si,
(3) little effective: Sn, Bi, Te,
(4) slight accelerating effect on corrosion: C, Mn,
(5) accelerating effect on corrosion: P, S, Ti, Mo, Cr, Ni (The corrosion rate was linear to the sulfur content, and exponential to the phosphorus content).


(Received 1968/3/26)

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