TCP和T706对航空涡轮发动机润滑油腐蚀磨损性能的影响机理

INFLUENCE MECHANISM OF TCP AND T706 ON CORROSION WEAR PERFORMANCE OF AERO-TURBINE ENGINE LUBRICATING OIL

针对航空涡轮发动机润滑油对涡轮发动机传动系统摩擦副表面造成腐蚀磨损的问题,基于航空涡轮发动机润滑油腐蚀磨损评价方法,利用四球试验机研究了航空涡轮发动机润滑油中添加剂三甲酚磷酸酯(TCP)和苯骈三氮唑(T706)的杂质氯、硫含量对摩擦副腐蚀磨损的影响,并揭示了其影响腐蚀的机理。结果表明:TCP和T706中的杂质氯都引起金属腐蚀磨损,T706中氯对腐蚀磨损的影响大于TCP中氯的影响,是产生腐蚀磨损的主要因素;T706中氯引起的腐蚀主要为电化学腐蚀,而非化学腐蚀;T706中的硫对金属表面腐蚀的影响较复杂,硫含量较低时,易发生浅表腐蚀,硫含量较高时易发生深度腐蚀,形成密集的腐蚀大坑;有机酸不是产生金属腐蚀的主要因素,引入酸捕捉剂对金属腐蚀无明显改善;尿素作为缓蚀剂,可极大改善T706中氯引起的金属腐蚀。

Aiming at the problem of corrosion wear caused by aviation turbine engine lubricating oil on the friction surface of the transmission system of the turbine engine,based on the evaluation method of corrosion wear of aviation turbine engine lubricating oil,the influence of impurities such as chlorine and sulfur content in the additives of trimethylphenol phosphate(TCP)and benzotriazole(T706)in aviation turbine engine lubricating oil on the corrosion wear of the friction pair was studied by using a four ball tester,and the mechanism of its impact on corrosion was revealed.The results showed that impurities such as chlorine in both TCP and T706 could cause corrosion wear of metal,the influence of chlorine in T706 on corrosion wear was greater than that of chlorine in TCP.The corrosion caused by chlorine in T706 is mainly electrochemical corrosion,but not chemical corrosion.However,the influence of sulfur in T706 on surface corrosion of metal is more complicated,when the sulfur content is low,shallow corrosion is prone to occur;when the sulfur content is high,deep corrosion occurs,forming dense corrosion pits.Organic acid is not the main factor causing metal corrosion,so the introduction of acid scavengers does not significantly improve metal corrosion.Urea as a corrosion inhibitor can greatly improve the metal corrosion caused by chlorine in T706.