摘要
为解决水煤浆不锈钢喷嘴抗氧化性能较差的问题,本文采用电泳沉积镀铝-高温氧化两步法在316L不锈钢上制备氧化铝涂层,重点研究了电泳沉积工艺参数对铝镀层沉积量的影响。将镀铝后的试样在氩气中700℃热处理使铝镀层均匀致密,再将热处理后的铝镀层进行高温氧化,之后对氧化铝涂层的形貌、成分和硬度进行分析。结果表明:当沉积液中PVB为40 g/L、铝粉为100 g/L、九水硝酸铝为120 g/L,在沉积电压100 V下沉积5 min时,所得到的铝镀层沉积量最大。在基体和氧化铝涂层之间还存在一个过渡层,过渡层与基体间产生了冶金结合,氧化铝涂层硬度最高可达932.8HV。在1000℃下氧化15 h后,氧化铝涂层试样无任何变化,而不锈钢裸样增重0.43%且出现脱皮和变色。
To address the issue of poor oxidation resistance in stainless steel nozzles for water-coal slurry,this study employed a two-step method involving electrophoretic deposition of aluminum followed by high-temperature oxidation to fabricate an alumina coating on 316L stainless steel.The focus was on the influence of electrophoretic deposition process parameters on the deposition amount of the aluminum coating.The aluminum-coated samples were heat-treated at 700℃under argon atmosphere to ensure that the aluminum coating becomes uniform and dense.Subsequently,the heat-treated aluminum coating underwent high-temperature oxidation,after which the morphology,composition,and hardness of the alumina coating were analyzed.The results show that,when the polyvinyl butyral concentration in the deposition solution is 40 g/L,the aluminum powder concentration is 100 g/L,the aluminum nitrate nonahydrate concentration is 120 g/L,and the deposition voltage is 100 V for 5 min,the deposition amount of the aluminum coating reaches its maximum.A transition layer exists between the substrate and the alumina coating,forming a metallurgical bond between the transition layer and the substrate.The hardness of the alumina coating can reach up to 932.8HV.After an oxidation at 1000℃for 15 h,the alumina-coated sample remains unchanged,whereas the bare stainless steel sample exhibits a mass gain of 0.43%,along with peeling and discoloration.
作者
彭嘉豪
孙威
申雨竹
熊翔
PENG Jiahao;SUN Wei;SHEN Yuzhu;XIONG Xiang(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《中国有色金属学报》
北大核心
2025年第8期2625-2638,共14页
The Chinese Journal of Nonferrous Metals
基金
河南心连心化工集团有限公司资助项目(HKF202400766)。
关键词
316L不锈钢
电泳沉积镀铝
氧化铝涂层
抗氧化性能
硬度
316L stainless steel
electrodeposition aluminium plating
alumina coating
antioxidant property
hardness
