氧化不同时间(Ni,Pt)Al涂层的退除及再涂覆行为研究  

Stripping and Refurbishment of(Ni,Pt)Al Coating After Service for Different Oxidation Durations

作　　者：张彩云 李帅 鲍泽斌 朱圣龙[1,2] 王福会 ZHANG Caiyun;LI Shuai;BAO Zebin;ZHU Shenglong;WANG Fuhui(Corrosion and Protection Center,Northeastern University,Shenyang 110819,China;Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]东北大学腐蚀与防护中心,沈阳110819 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《中国腐蚀与防护学报》2025年第1期201-208,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52301116和51671202)。

摘　　要：本文研究了(Ni,Pt)Al涂层氧化不同时间后涂层退除及再涂覆,尤其不同服役时间氧化后涂层及下方基体合金组织结构的演变。采用电镀Pt层和化学气相渗铝的方法在镍基单晶高温合金上制备了(Ni,Pt)Al涂层,然后对涂层试样在1100℃中分别氧化300、1000和3000 h。表明不同时间氧化后涂层表面生成的氧化产物都为Al_(2)O_(3);随着氧化时间的增长,涂层退化严重且涂层下方析出的TCP相增多。在HCl和C_(6)H_(8)O_(7)·H_(2)O的混合溶液中成功退除不同时间氧化后的(Ni,Pt)Al涂层,涂层的退除主要是沿晶界溶解,并随着Al含量的减少,溶解速率下降,而重新沉积的(Ni,Pt)Al涂层微观组织结构差异不大,长时间氧化后的试样单晶基体侧粗大TCP相析出增多。The stripping and refurbishment of single-phase(Ni,Pt)Al coating after oxidation for different times was investigated,especially in terms of the microstructure evolution of coating and substrate.The(Ni,Pt)Al coating was prepared on a Ni-based single crystal superalloy N5 firstly via electro-deposition of a thin Pt-film and followed by above-pack aluminizing.Afterwards,the prepared(Ni,Pt)Al coating/N5 alloy was oxidized in air at 1100℃for 300,1000 and 3000 h,respectively,where in all cases Al_(2)O_(3)was the exclusive oxide product on all the test coatings.Moreover,with the increase of oxidation time,the coating degraded severely and coarse TCP precipitates emerged out beneath the coating.The(Ni,Pt)Al coatings after oxidation for various times were successfully removed with mixed solution of HCl and C_(6)H_(8)O_(7)·H_(2)O.Finally,a fresh(Ni,Pt)Al coating was refurbished again on the alloy of the deteriorated coating being removed.During the stripping with mixed acids,the dissolution of coating is mainly ascribed to corrosion of grain boundaries,while the dissolution rate decreases with the reduction of Al-content.However,the microstructure of the refurbished(Ni,Pt)Al coating is little different from those prepared on the as received alloy,nevertheless,it is observed that the coarse precipitates of TPC phase emerged on the alloy side after long time oxidation.

关 键 词：高温合金 (Ni Pt)Al 涂层 高温氧化 涂层退除 再涂覆 

分 类 号：TG172[金属学及工艺—金属表面处理]