Department of Mechanical Engineering, Motilal Nehru National Institute of Technology, Allahabad, India.
World J Microbiol Biotechnol. 2013 Dec;29(12):2353-7. doi: 10.1007/s11274-013-1402-5. Epub 2013 Jun 14.
In the current study, ferritic stainless grades AISI 439 and AISI 444 were investigated as possible construction materials for machinery and equipment in the cane-sugar industry. Their performance in corrosive cane-sugar juice environment was compared with the presently used low carbon steel AISI 1010 and austenitic stainless steel AISI 304. The Tafel plot electrochemical technique was used to evaluate general corrosion performance. Microbiologically influenced corrosion (MIC) behaviour in sugarcane juice environment was studied. Four microbial colonies were isolated from the biofilms on the metal coupon surfaces on the basis of their different morphology. These were characterized as Brevibacillus parabrevis, Bacillus azotoformans, Paenibacillus lautus and Micrococcus sp. The results of SEM micrographs showed that AISI 439 and AISI 304 grades had suffered maximum localized corrosion. MIC investigations revealed that AISI 444 steel had the best corrosion resistance among the tested materials. However from the Tafel plots it was evident that AISI 1010 had the least corrosion resistance and AISI 439 the best corrosion resistance.
在本研究中，研究了铁素体不锈钢等级 AISI 439 和 AISI 444，作为制糖工业中机械设备的潜在结构材料。将它们在腐蚀性甘蔗糖汁环境中的性能与目前使用的低碳钢 AISI 1010 和奥氏体不锈钢 AISI 304 进行了比较。使用 Tafel 图电化学技术评估了一般腐蚀性能。研究了微生物影响腐蚀（MIC）在甘蔗糖汁环境中的行为。根据不同的形态，从金属试片表面生物膜上分离出了四个微生物菌落。它们被鉴定为 Brevibacillus parabrevis、Bacillus azotoformans、Paenibacillus lautus 和 Micrococcus sp。SEM 显微照片的结果表明，AISI 439 和 AISI 304 等级遭受了最大的局部腐蚀。MIC 研究表明，在测试的材料中，AISI 444 钢具有最好的耐腐蚀性。然而，从 Tafel 图可以明显看出，AISI 1010 的耐腐蚀性最差，AISI 439 的耐腐蚀性最好。
