铜业工程Issue(1)：29-37,9.DOI:10.3969/j.issn.1009-3842.2024.01.003
铜管在羧酸环境下的腐蚀行为和腐蚀机理研究
Corrosion Behavior and Mechanisms of Copper Tube in Carboxylic Acid Envi-ronment
摘要
Abstract
Copper tube is the key component of the heat exchangers used in air conditioning and refrigeration industry.However,the equipment is often failed in advance because of the ant-nest corrosion(ANC)of the copper tube during the service.In this paper,corro-sion behavior and corrosion mechanisms of copper tubes in carboxylic acids were analyzed by vapor corrosion tests and electrochemical tests.The surface morphology and the structure of corrosion products were observed and analyzed by metallographic microscope(OM),scanning electron microscope(SEM)and X-ray powder diffractometer(XRD).The interface behavior between carboxylic acid and cop-per tube was studied by contact angle measurement.The results showed that the corrosion rate of copper tube in formic acid(HCOOH)vapor was slower and the corrosion product is denser than that in acetic acid(CH3COOH)vapor.HCOOH is more easily to cause ANC of copper tube than CH3COOH.ANC is a special electrochemical corrosion,and the corrosion mechanism is complex.The wettability of HCOOH on copper tube surface was worse than CH3COOH.In the early stages of corrosion,the surface oxide film was dissolved by the small droplets of carboxylic acid on the copper tube surface firstly.The exposed copper matrix acted as the micro-anode,and then the tip of the micro-crack generated in the corrosion pit acted as the micro-anode,and the corrosion rate was accelerated until it penetrated the tube wall.关键词
铜管/羧酸/蚁穴腐蚀/电化学腐蚀/金相组织Key words
copper tube/carboxylic acid/ant-nest corrosion/electrochemical corrosion/metallurgical structure分类
矿业与冶金引用本文复制引用
李海红,秦世腾,王忠琦,李德山,刘晓,王松伟..铜管在羧酸环境下的腐蚀行为和腐蚀机理研究[J].铜业工程,2024,(1):29-37,9.基金项目
山东省自然科学基金项目(ZR2018ME005)资助 （ZR2018ME005）
