HCPEB輻照AZ91合金表面脈沖電沉積鈣磷涂層的組織和性能
[Abstract]:On the basis of studying the effect of high current pulsed electron beam (HCPEB) irradiation times on the microstructure, hardness and corrosion resistance of the remelted layer, HCPEB irradiated AZ91 was deposited by pulse electrochemical deposition of calcium and phosphorus coating. The effect of HCPEB irradiation on the morphology of calcium and phosphorus coating on AZ91 surface was studied and the kinetic process of its formation was elucidated. The effect of HCPEB irradiation on the corrosion resistance of calcium phosphate coating deposited by pulsed electrodeposition on AZ91 surface was revealed. The experimental results show that when the pulse current period is 1 s, when the duty cycle is 0.05 ~ 0.100.100.15g / 0.20, with the increase of duty cycle, the HAP,Ca_ _ (10) (PO_4) _ 6 (OH) _ 2 (HAP,Ca_ _ (10) (PO_4) _ 6 (OH) _ 2) appears in the HAP,Ca_ _ (10) (PO_4) _ 6 (OH) _ 2. When the pulse current duty cycle is 0.10, when the period is 0.1 s ~ (-1) s and 10 s, with the increase of pulse period, the sheet DCPD. is present in the acicular HAP calcium phosphorus coating perpendicular to the surface of AZ91 alloy. The results of electrochemical corrosion and immersion test showed that the corrosion resistance of AZ91 alloy was improved after pulse electrodeposition. When the pulse current period is 1 s and the duty cycle is 0.10, the acicular pure HAP coating has the highest density, the smallest pore size and the finest particle size. The best corrosion resistance of .AZ91 alloy in SBF solution is irradiated by HCPEB with energy density of 6 J/cm~2. There were a large number of dense spherical structures, fold structures and melting pits. The hardness of AZ91 alloy increased from 65. 6 HV to 75. 0 HV. the roughness of AZ91 alloy was increased from 65. 6 HV to 75. 0 HV.. With the increase of HCPEB irradiation times, the remelting layer of AZ91 alloy becomes thicker, the roughness decreases gradually, and the solid solution element al in 偽 -mg increases gradually. The corrosion current decreases by one order of magnitude after being irradiated as a supersaturated solid solution for 3 times and 5 times for 10 times. The corrosion resistance is improved effectively. When irradiation times were more than 10 times, the al element in 偽 -mg solution began to decrease, and Mg_ (17) Al_ (12) phase was precipitated. The corrosion resistance of AZ91 alloy was aggravated by galvanic corrosion reaction. After irradiation, the surface roughness and surface area of AZ91 alloy became the largest and the surface area became larger. As a result, the current passing through the unit area is reduced, and the nucleation and growth behavior of the electrodeposition of calcium and phosphorus coating on the surface of the alloy is changed. After three times of irradiation, the roughness of AZ91 alloy is the largest. The surface roughness of hap and dcpd.AZ91 alloy was reduced after 5 times and 10 times of irradiation. The deposition of calcium and phosphorus coating contained only needle-like hap.AZ91 alloy irradiated by hcpeb, which had a great influence on the deposition and growth process of calcium phosphorus coating. When the deposition time was increased from 1min to 30min, the morphology of hap Ca P coating on unirradiated AZ91 alloy changed from stripe to needle, and after 5 times irradiation, the morphology of hap Ca P coating on AZ91 alloy changed from granular to reticular, then to flake. It turned into a needle. The results of electrochemical corrosion and immersion experiments showed that compared with the direct pulse electrodeposition of calcium and phosphorus coating on AZ91 alloy, the electrodeposition of calcium phosphorus coating was carried out under the double protection of calcium phosphorus coating and remelting layer. The corrosion resistance is improved effectively. After 5 times of irradiation, the coating structure of Ca- AZ91 alloy deposited by pulse electrodeposition in sbf solution for 14 days remained intact, and the hydrogen evolution rate was about 7.57 for the ph value of AZ91 alloy 12.10 / sbf solution, and the corrosion resistance was the best.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG174.4
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