铝合金硬质阳极氧化提高15-5PH不锈钢表面性能

Improving Surface Properties of 15-5PH Stainless Steel by Hard Anodic Oxidation of Aluminum Alloy

以15-5PH不锈钢试样为研究对象,首先实施不锈钢热浸镀铝工艺,再利用聚四氟乙烯(PTFE)进行铝合金硬质阳极氧化处理,考察不同实验条件下所得阳极氧化膜的表面性能。研究发现:依照热震测试方法(GB/T 5270—2005)对试样反复加热、激冷,热浸镀铝层和阳极氧化膜都与基体结合牢固,具有较好的结合强度;硅含量6%、热浸镀铝温度630℃、热浸镀铝时间2 min可作为理想的不锈钢热浸镀铝工艺参数,可得到15 μm厚度的热浸镀铝层;添加PTFE纳米乳化液进行硬质阳极氧化,所得PTFE-A1_(2)O_(3)氧化膜相比普通A1_(2)O_(3)氧化膜具有更好的化学稳定性和热稳定性;当PTFE纳米乳化液含量为25%时,PTFE-A1_(2)O_(3)氧化膜自润滑性最好。

Taking 15-5PH stainless steel samples as the research object,firstly,hot-dip aluminizing process of stainless steel was implemented,and then,hard anodic oxidation of aluminum alloy was carried out using polytetrafluoroethylene (PTFE).The surface properties of anodic oxide film obtained under different experimental conditions were investigated.Findings:the hot-dip aluminized film and the anodic oxide film are firmly bonded to the substrate with good bonding strength after repeated heating and chilling as per the thermal shock test (GB/T 5270—2005);silicon content of 6%,hot-dip aluminizing temperature of 630℃ and hot-dip aluminizing time of 2 min can be used as the ideal process parameters for the hot-dip aluminizing of stainless steel,and a hot-dip aluminizing layer with a thickness of 15 μm can be obtained;the PTFE-A1_(2)O_(3)oxide film obtained by adding PTFE nano-emulsion for hard anodic oxidation has better chemical stability and thermal stability than the common A1_(2)O_(3)oxide film;when the content of PTFE nano-emulsion is 25%,the self-lubricating property of PTFE-A1_(2)O_(3)oxide film is the best.