Effect of combination of ultraviolet radiation and biocide on fungal-induced corrosion of high-strength 7075 aluminum alloy

紫外辐射和杀菌剂组合对高强7075铝合金霉菌腐蚀的影响

The effect of ultraviolet(UV)radiation and biocide benzalkonium chloride(BKC)on fungal-induced corrosion of AA7075 induced by Aspergillus terreus(A.terreus)was deeply studied using analysis of biological activity,surface analysis,and electrochemical measurements.Results demonstrated that the planktonic and sessile spore concentrations decline by more than two orders of magnitude when UV radiation and BKC are combinedly used compared with the control.UV radiation can inhibit the biological activity of A.terreus and influence the stability of passive film of AA7075.Except for direct disinfection,the physical adsorption of BKC on the specimen can effectively inhibit the attachment of A.terreus.The combination of UV radiation and BKC can much more effectively inhibit the corrosion of AA,especially pitting corrosion,due to their synergistic effect.The combined application of UV radiation and BKC can be a good method to effectively inhibit fungal-induced corrosion.

通过生物活性分析、表面分析和电化学测量等方法,深入研究紫外辐射和杀菌剂苯扎氯铵对由土曲霉引起的高强7075铝合金真菌腐蚀的影响。与对照组相比,当紫外辐射和苯扎氯铵联合使用时,附着在材料表面的孢子浓度和溶液中浮游孢子浓度均下降了两个数量级以上。紫外辐射可抑制霉菌的生物活性,影响铝合金钝化膜的稳定性。除直接杀菌外,苯扎氯铵在材料表面的物理吸附可以有效抑制霉菌的附着。紫外辐射和苯扎氯铵的联合使用通过协同作用,可以更有效地抑制铝合金的腐蚀,尤其是点蚀。因此,紫外辐射和苯扎氯铵的联合使用可作为一种良好的方法有效抑制真菌腐蚀。