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目前,各地小氮肥厂的设备腐蚀严重,寿命很短,由此造成材料消耗量较大,经初步试验认为,碳素钢渗铝材料(渗铝钢)对氨和碳酸氢铵有较好的抗腐蚀性能,将渗铝钢应用于氮肥生产线上的易腐设备与零件上,不但可以提高其使用寿命,而且还可以部分代替不锈钢. 一、液体渗铝工艺流程及规范1.除油:先用汽油粗除油,然后进行化学除油. 化学除油液配方: 氢氧化钠25～30% 碳酸钠15～20% 温度80～100℃时间20～30分钟2.冲洗:用流动水仔细冲洗掉污渣. 3.酸洗去锈:经机加工的零件用1:1
At present, the equipment of small nitrogenous fertilizer plants in all places are seriously corroded and their life span is very short. As a result, the consumption of materials is large. According to preliminary tests, the carbonized aluminized materials (aluminized steel) have better ammonia and ammonium bicarbonate Corrosion resistance, the aluminized steel applied to perishable equipment and parts on the nitrogen fertilizer production line, not only can improve its service life, but also can partially replace the stainless steel. A liquid aluminizing process and specifications 1. Degreasing: the first Chemical degreasing formula: Sodium hydroxide 25 ~ 30% Sodium carbonate 15 ~ 20% Temperature 80 ~ 100 ℃ Time 20 ~ 30 minutes 2. Rinse: Wash with running water carefully 3. Remove pickling rust: machined parts with 1: 1