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上海石化总厂的化工二厂,针对醋酸回收塔下部纯钛及钛—钼—镍制成的螺栓、螺母的严重腐蚀情况,采用预氧化处理方法,取得了明显的防腐效果。这些钛制紧固件经常处于醋酸大于98%、甲酸为0.5～1.5%、温度达130℃的特殊工作环境,工作一年后就会发生严重腐蚀——表面发黑、尺寸变小,有的甚至腐蚀掉二分之一。该厂采取的具体措施是:
Shanghai Petrochemical Plant Chemical Plant, aiming at the serious corrosion situation of bolts and nuts made of pure titanium and titanium-molybdenum-nickel in the bottom of acetic acid recovery tower, the pre-oxidation treatment method has been adopted and obvious anti-corrosion effect has been achieved. These titanium fasteners are often in a special working environment with acetic acid of more than 98%, formic acid of 0.5 to 1.5% and temperature of 130 ℃. Severe corrosion will occur after one year’s work - the surface is black and the size is small, and some Even corroded by half. The specific measures taken by the plant are: