DZ125合金HY3包覆型涂层退除研究

目的 研究化学法退除DZ125合金HY3包覆型涂层。方法 采用真空电弧镀技术（AIP）在定向凝固镍基高温合金DZ125上制备包覆型涂层HY3，利用化学方法完全退除基体上的涂层，通过失重法研究对比1#和2#退除溶液退除HY3涂层和DZ125合金的退除速率，采用扫描电镜（SEM）对退除后的HY3涂层和DZ125基体的微观组织进行观察。结果 经过100 min，2#溶液可以将20 ?m左右的HY3涂层完全退除，采用1#溶液需要超过100 min才能完全退除涂层。两种对DZ125合金的腐蚀性很小，对于同一种合金而言，1#溶液和2#溶液对合金的腐蚀速率比值为1︰13。在1#溶液中，合金与涂层腐蚀速率的比值为1︰87.65；在2#退除溶液中，合金与涂层腐蚀速率的比值为1︰6.81。结论 1#溶液更加适合退除DZ125合金上的HY3涂层。

Removing HY3 Coating on DZ125 Alloy

Objective To research the method for chemical removing of HY3 overlay coating on DZ125 alloy. Methods The arc vacuum spraying technology was used to prepare overlay coating on the controlled directional solidification nickel-base su-per-alloy. The coating was basically removed via chemical method. The removing rate of HY3 and DZ125 alloy with removing solution 1# and 2# were compared through the weight loss method. The microstructure of HY3 coating and DZ125 substrate after removing were observed with SEM. Results The coatings were fully removed by solution 2# 100 min later; while it took over 100 min for soluntion1#. Both have small corrosion to DZ125 alloy. For the same alloy, the removing ratio of solution 1# and solution 1# was 1:13. In solution 1#, the corrosion rate of alloy and coating was 1:87.65. In solition 2#, the corrosion rate of alloy and coating is 1:6.81. Conclusion It is showed that solution 1# is more suitable for removing the coating.