(1. 哈爾濱工業(yè)大學(xué) 應(yīng)用化學(xué)系， 哈爾濱 150001;
2. Engineering Department， Kyoto University， Kyoto 606-8283， Japan)
摘 要: 在硫酸鹽鍍鋅液中所得的含鉛與不含鉛的鍍鋅試片，經(jīng)鉻酸鹽鈍化后，通過濕熱試驗(HCT)進(jìn)行了黑變培養(yǎng)。采用試片的表面明度差來表征黑變的程度，考察了鉛和光照對其黑變速率的影響。發(fā)現(xiàn)鍍液中鉛離子的存在使黑變反應(yīng)的活化能 Ea 從34 kJ/mol左右降低到21 kJ/mol左右，從而加速了黑變反應(yīng)。光照雖然使 Ea 降低了0.5kJ/mol，但同時較大幅度地降低了指前因子A 的值，總的作用結(jié)果是抑制了黑變的反應(yīng)。
關(guān)鍵字: 硫酸鹽鍍鋅； 鉛離子； 鉻酸鹽鈍化； 光照； 黑變速率
（1. Department of Applied Chemistry， Harbin Institute of Technology， Harbin 150001， P.R.China；
2. Engineering Department， Kyoto University， Kyoto 606-8283， Japan）
Abstract: The rates of black patina formation chromated zinc plates were studied by surface lightness difference method and humidity cabinet test (HCT)， under the conditions with and withoutillumination. Zinc plates were obtained from sulphate baths with and without lead ion. It was found that lead ion can decrease theactivation energy Ea of black patina formation from about 34 kJ/mol to about 21 kJ/mol， and accelerates the rate of black patina. Illumination decreases the Ea by 0.5 kJ/mol， but also decreases preexponential factor A to a great extent， and the total effects of illumination withhold the rate of black patina.
Key words: sulphate zinc plating; lead ion; chromated; illumination; rate of black patina
