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前言 现就化工厂广泛使用的硫酸、烧碱造成的碳钢等腐蚀事例及其对策,以及最近日本耐腐衬里的实际情况作一介绍。 1.浓硫酸贮存设备的腐蚀及其对策 在H_2SO_4中,通常使用的金属材料为:稀硫酸使用铅,浓硫酸使用碳钢,经过硫酸的化学作用分别形成PbSO_4或FeSO_4保护膜而获得耐腐蚀性。 1-1 按浓度、温度划分使用限度 硫酸的浓度、温度对碳钢和不锈钢使用范围的限制,碳钢上限为30℃,下限为10℃(98％),安全使用范围小。
Foreword Now on the chemical plant widely used sulfuric acid, caustic soda caused by carbon steel and other corrosion cases and countermeasures, as well as the recent Japanese anti-corrosion liner made an introduction to the actual situation. 1. Concentrated sulfuric acid storage equipment corrosion and its countermeasures In H_2SO_4, the commonly used metal materials are: dilute sulfuric acid using lead, concentrated sulfuric acid using carbon steel, respectively, after the chemical effect of sulfuric acid to form PbSO_4 or FeSO_4 protective film to obtain corrosion resistance . 1-1 Limitation by Use of Concentration and Temperature Limits of the use of sulfuric acid and temperature to the range of carbon steel and stainless steel. The upper limit of carbon steel is 30 ° C, and the lower limit is 10 ° C (98%). The safe use is small.