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氨基磺酸等酸性清洗液进行酸洗的温度和时间控制
来源:http://www.jnjrh.com 日期:2019-12-02 发布人:admin
  一、清洗温度
  I. cleaning temperature
  酸洗过程中酸液温度越高,清洗能力越强,但金属的腐蚀速度也随之增加,而大多数缓蚀剂的缓蚀能力随温度升高而降低。因此,为了控制酸洗时的腐蚀,酸洗温度要适度,氢氟酸清洗温度一般采用45~55℃,盐酸、硫酸、硝酸、氨基磺酸清洗温度一般采用50~60℃,柠檬酸、羟基乙酸的清洗温度为85~95℃,EDTA高温清洗温度为120~140℃。EDTA低温清洗温度为85~95℃。
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  The higher the acid temperature is, the stronger the cleaning ability will be, but the corrosion rate of metal will increase, and the corrosion inhibition ability of most inhibitors will decrease with the increase of temperature. Therefore, in order to control the corrosion during pickling, the pickling temperature should be moderate. Generally, the cleaning temperature of hydrofluoric acid is 45-55 ℃, hydrochloric acid, sulfuric acid, nitric acid and sulfamic acid is 50-60 ℃, citric acid and hydroxyacetic acid are 85-95 ℃, and EDTA is 120-140 ℃. EDTA low temperature cleaning temperature is 85 ~ 95 ℃.
  二、清洗时间
  II. Cleaning time
  硫酸、盐酸清洗溶液中存在大量的氢离子,加温以后的硫酸、盐酸清洗溶液与金属接触的时间一般不超过10h,防止发生金属渗氢,引起金属材料的氢脆。防止发生应力腐蚀和晶间腐蚀。选用的清洗介质、缓蚀剂中不应含有易产生晶间腐蚀的敏感离子,同时还应进行应力腐蚀和晶间腐蚀试验。监视管。酸洗监视管应在清洗系统开始进酸时同步投入,并控制监视管内流速与被清洗系统的管内流速相一致。
  There are a lot of hydrogen ions in sulfuric acid and hydrochloric acid cleaning solution. The contact time between the heated sulfuric acid and hydrochloric acid cleaning solution and metal is generally not more than 10 hours, so as to prevent metal hydrogen permeation and hydrogen embrittlement of metal materials. Prevent stress corrosion and intergranular corrosion. The selected cleaning medium and inhibitor shall not contain sensitive ions that are easy to produce intergranular corrosion, and stress corrosion and intergranular corrosion tests shall also be carried out. Monitor tube. The pickling monitoring pipe shall be put into operation synchronously when the cleaning system starts to feed acid, and the flow rate in the monitoring pipe shall be controlled to be consistent with that in the pipe of the system to be cleaned.
  三、何时停止清洗
  III. when to stop cleaning
  当每一个回路清洗到预定时间后,加强进、回水的酸洗液浓度和铁离子浓度的分析,检查趋于平衡的程度,当基本达到平衡,进、回水的酸浓度和铁离子浓度的分析结果相差小于5%时,可以取下监视管检查清洗效果。当酸洗液中铁离子浓度趋于稳定,监视管段内基本清洁后,再循环1h左右,即可停止酸洗。
  When each circuit is cleaned to a predetermined time, strengthen the analysis of the acid pickling solution concentration and iron ion concentration of the inlet and return water, and check the degree of balance. When the balance is basically reached, and the difference between the analysis results of the acid concentration and iron ion concentration of the inlet and return water is less than 5%, the monitoring tube can be taken down to check the cleaning effect. When the concentration of iron ion in the acid washing solution tends to be stable and the monitoring pipe section is basically cleaned, the acid washing can be stopped after recycling for about 1H.
  四、铜沉积处理
  IV. copper deposition treatment
  酸洗中在金属表面产生了铜沉积(又称镀铜),可在酸洗后用25~30℃的3%~1.5%氨水和0.5%~0.75%过硫酸氨溶液清洗1~1.5h,随后排掉溶液,再用0.8%NaOH和0.3%Na?PO4溶液进行清洗。
  Copper deposition (also known as copper plating) is produced on the metal surface in acid pickling. After acid pickling, 3% ~ 1.5% ammonia water and 0.5% ~ 0.75% ammonia persulfate solution at 25 ~ 30 ℃ can be used for cleaning for 1 ~ 1.5h, then the solution is discharged, and then 0.8% NaOH and 0.3% Na? PO4 solution are used for cleaning.