发动机机油冷却器泄漏分析及改进  

Engine Oil Cooler Failure Analysis and Improvement

作　　者：宋乐平 周毅[1] 朱涛 SONG Leping;ZHOUYi;ZHU Tao(School ol Automotive Studies,Tongji Univeristy, Shanghai 201804, China)

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《内燃机与动力装置》2017年第6期44-47,64,共5页Internal Combustion Engine & Powerplant

摘　　要：针对某汽油发动机机油冷却器的泄漏失效进行研究。通过X射线裂纹扫描技术以及SEM(扫描电子显微镜)分析等方法,发现机油冷却器的泄漏原因为生产过程中局部区域过量的助焊剂与冷却液发生水解反应,导致在该区域无法形成冷却液防腐保护膜,并伴随产生了白色絮状产物,由于该腐蚀区域存在电化学腐蚀,加剧水解反应过程,最终导致机油冷却器泄漏。通过优化冷却液的配方组分,有效地抑制了助焊剂的水解反应过程,从而达到提高零件的防腐蚀能力。This paper focuses on the internal leakage failure ol a gasoline engine oil cooler. By X-Ray crack scan and SEM analysis technology,it was lound that the reason lor the internal leakage of the oil cooler was hydrolysis reaction between excess flux remained from welding process and cool-ant. The hydrolysis reaction leading to the anticorrosive protective film not be able to form in the are-a. As a result,white gels was created with hydrolysis reaction on going. Because of the electrochemi-cal corrosion in the region,the process of hydrolysis reaction was increased,which resulted in the leakage of oil cooler.By optimizing the formulation component of the coolant,the hydrolysis reaction process of the flux can be effectively inhibited,thus improving the anti-corrosion ability of the parts.

关 键 词：机油冷却器 助焊剂 泄漏 腐蚀 冷却液 

分 类 号：TK414.2[动力工程及工程热物理—动力机械及工程]