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[1]吕 芳,谷 娜*.化工管道连接法兰磷化工艺条件优化及磷化膜的耐蚀性[J].电镀与精饰,2022,(3):59-63.[doi:10.3969/j.issn.1001-3849.2022.03.011]
　LYU Fang,GU Na *.Optimization of Phosphating Process Conditions for Chemical Pipe Connection Flange and Corrosion Resistance of Phosphating Film[J].Plating & Finishing,2022,(3):59-63.[doi:10.3969/j.issn.1001-3849.2022.03.011]
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化工管道连接法兰磷化工艺条件优化及磷化膜的耐蚀性

《电镀与精饰》[ISSN:1001-3849/CN:12-1096/TG] 卷: 期数: 2022年3 页码: 59-63 栏目: 出版日期: 2022-03-01
Title:
Optimization of Phosphating Process Conditions for Chemical Pipe Connection Flange and Corrosion Resistance of Phosphating Film
作者:
吕 芳1; 谷 娜2*
（1.河北工业职业技术大学 环境与化学工程系，河北 石家庄 050091； 2.河北科技大学 理学院，河北 石家庄 050018）
Author(s):
LYU Fang 1 ;  GU Na 2*
( 1.Department of Environmental and Chemical Engineering Hebei Vocational University of Industry and Technology Shijiazhuang 050091 China 2.College of Science Hebei University of Science and Technology Shijiazhuang 050018 China )
关键词:
磷化工艺条件; 磷化膜; 法兰; 耐蚀性
Keywords:
phosphating process conditions;  phosphating film;  flange;  corrosion resistance
分类号:
TG174.4
DOI:
10.3969/j.issn.1001-3849.2022.03.011
文献标志码:
A
摘要:
以化工管道连接使用的 Q235 钢法兰为研究对象，对其进行磷化处理以提高耐蚀性。采用正交试验法考察了磷酸二氢锌浓度、氟化钠浓度、硝酸镧浓度、磷化液温度和磷化时间对磷化膜耐 CuSO 4 点蚀时间的影响，并通过极差分析得到最佳磷化工艺条件为：磷酸二氢锌浓度 60 g/L 、氟化钠浓度 2.5 g/L 、硝酸镧浓度 40 mg/L 、磷化液温度 70 ℃ 、磷化时间 15 min 。将最佳磷化工艺条件用于法兰磷化处理，结果表明：法兰表面磷化膜呈深灰色，覆盖完整并且致密性较好，其物相组成为 Zn 3 （ PO 4 ） 2 ·4H 2 O 和 Zn 2 Fe （ PO 4 ） 2 ·4H 2 O ，腐蚀电位较 Q235 钢基体正移了约 70 mV ，腐蚀电流密度降低了至少一个数量级。该磷化膜能有效阻隔腐蚀介质延缓腐蚀，使磷化处理后法兰的耐蚀性显著提高。
Abstract:
： The Q235 steel flange for chemical pipe connection was treated by phosphating in order to improve its corrosion resistance ， and the influence of zinc dihydrogen phosphate concentration ， sodium fluoride concentration ， lanthanum nitrate concentration ， phosphating solution temperature and phosphating time on CuSO 4 pitting time of phosphating film was investigated by orthogonal experiment. The optimal phosphating process conditions obtained by range analysis were as follows ： zinc dihydrogen phosphate 60 g/L ， sodium fluoride 2.5 g/L ， lanthanum nitrate 40 mg/L ， phosphating solution temperature 70 ℃ and phosphating time 15 min ， and the optimal phosphating process conditions were applied to the phosphating treatment of flange. The results showed that the phosphating film on the surface of flange was dark gray ， completely covered and has good compactness ， the phase composition was Zn 3 （ PO 4 ） 2 ·4H 2 O and Zn 2 Fe （ PO 4 ） 2 ·4H 2 O. The corrosion potential of phosphating film was about 70 mV higher than that of Q235 steel matrix ， and the corrosion current density was reduced by at least one order of magnitude. This phosphating film can effectively block the corrosive medium and delay the corro sion ， so that the corrosion resistance of the flange after phosphating treatment was significantly improved.

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备注/Memo

收稿日期： 2021-05-27 修回日期： 2021-08-15 作者简介： 吕芳（ 1979 －），副教授，主要研究方向：化学工程、化工工艺等 * 通信作者： 谷娜（ 1981 －），博士，副教授，主要研究方向为化学工艺， E-mail ： hebei_6204@163.com 基金项目： 河北省教育厅河北省高等学校科学技术研究项目（ ZD2019033 ）

更新日期/Last Update: 2022-03-11