CAJ | 학술논문

采用5kW横流CO_2激光器在AA6063铝合金表面激光熔覆Al_3Ti金属间化合物涂层.研究了熔覆层的显微组织、电化学腐蚀和摩擦磨损性能.结果表明,熔覆层由树枝晶Al_3Ti和枝晶间仅.α-Al两相组成.并与基材形成良好的冶金结合.熔覆层在w(NaCl)=3.5%溶液中发生钝化,腐蚀电流密度约为基材的1/10;在载荷10 N、摩擦距离800m时,熔覆层的磨损质量损失低于基材的1/2,说明Al_3Ti金属间化合物涂层显著提高了基材的耐腐蚀和耐磨损性能.
채용5kW횡류CO_2격광기재AA6063려합금표면격광용복Al_3Ti금속간화합물도층.연구료용복층적현미조직、전화학부식화마찰마손성능.결과표명,용복층유수지정Al_3Ti화지정간부.α-Al량상조성.병여기재형성량호적야금결합.용복층재w(NaCl)=3.5%용액중발생둔화,부식전류밀도약위기재적1/10;재재하10 N、마찰거리800m시,용복층적마손질량손실저우기재적1/2,설명Al_3Ti금속간화합물도층현저제고료기재적내부식화내마손성능.
Al_31Ti intermetallic compound coating was laser cladded on AA6063 aluminum alloy by 5 kW transverse CO_2 laser processing system.The microstructure,electrochemical corrosion and wear resistance behaviors were investigated.The results show that,the laser cladding coating is made up of dendrites Al_3Ti and interdendrites α-Al,and has good bonding with the substrate.The coating passivated in 3.5%NaCI solution shows a one-tenth corrosion current density compared with that of the substrate.The wear mass loss of the coating is about one-half lower than that of the substrate under the condition of 10 N load and 800 m sliding distance.All the results indicate that Al_3Ti intermetallic compound coating greatly increase the corrosion and wear resistance of the substrate.