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| THE CORROSION BEHAVIOR OF ROTARY SPHERICAL DIGESTER IN NEUTRAL AMMONIUM SULFITE COOKING AND CORROSION CONTROL |
| Wu Jiesheng and Yang Deqing (Northwest Institute of Light Industry) |
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Abstract Conversion of the mild steel surface from active to passive state took place during heating of ammonium sulfite cooking. The results of surface analyses indicated that under passive conditions, a passive film was formed on the steel surface in ammonium sulfite liquors. The film consists of double layers, the outer layer being(NH_4)_2Fe(SO_3)_2·H_2O crystals; and the inner layer, iron oxide. Under active conditions,a loose mixture which was mostly FeS was formed on the steel surface. Several environmental effects on passivation were also investigated. Three simple corrosion prevention techniques were tried in the pulp mill, by which the corrosion rate of rotary spherical digester can be controlled under 0.2mm/y.
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Received: 25 June 1989
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[1] 轻工业部造纸研究所情报室,亚铵法制浆的腐蚀与防腐蚀,(1977)
[2] 杭州大学化学系分析化学教研室,分析化学手册(一),化学工业出版社,P.8
[3] U.R.Evans,《金属的腐蚀与氧化》:机械工业出版社,P.112 |
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