【摘要】：為研究Co改性鋁化物涂層在室溫環(huán)境中的耐蝕性,利用包埋法滲Co和氣相沉積滲Al(兩步法)制備出兩種不同Co含量的Co改性鋁化物涂層,采用XRD、SEM、EDS分析涂層的組織結(jié)構(gòu)。結(jié)果表明:850℃和1 000℃滲Co涂層外層和內(nèi)層均為γ-(Ni,Co)相,內(nèi)層有氮化物/碳化物相析出。Co改性鋁化物涂層與簡(jiǎn)單NiAl涂層結(jié)構(gòu)一致,外層為β-(Co,Ni)Al相,內(nèi)層為互擴(kuò)散區(qū)含有大量的富Cr(W)相。簡(jiǎn)單NiAl涂層的自腐蝕電流為0.04μA/cm2,約為Co改性鋁化物涂層的十分之一。這說(shuō)明在涂層中添加Co降低涂層的耐蝕性,一方面因?yàn)镃o的腐蝕電位(-0.28V)低于Ni的腐蝕電位(-0.25V),另一方面因?yàn)闈BCo過(guò)程中產(chǎn)生的夾雜物與涂層電位不一致,容易成為微陰極區(qū),加速涂層的腐蝕。
[Abstract]:In order to study the corrosion resistance of Co modified aluminized coatings at room temperature, two kinds of Co modified aluminized coatings with different Co content were prepared by embedding Co and vapor deposition Al (two-step method). The microstructure of the coatings was analyzed by XRD,SEM,EDS. The results showed that the outer layer and inner layer of Co coating were 緯-(Ni,Co) phase at 1 000 鈩，

本文編號(hào)：2207494