CAJ | 학술논문

背景：目前主要通过镀铬法提高软磁合金的抗腐蚀性能。目的：采用单因素实验法确定铁铬钼软磁合金和铁镍软磁合金表面镀铬的最佳工艺条件，提高其抗腐蚀能力。方法：铸造20 mm×20 mm×2 mm的方片状铁铬钼合金和铁镍合金各12片，表面经磨光、抛光、活化剂活化后进行镀铬，采用单因素实验法，选因素为电镀类型(分为6价铬和3价铬)、电流密度(15，20，25，35，40，45 A/dm2)和电镀时间(30，40，60 min)，考查指标为镀层硬度和厚度，硬度和厚度值越大镀层的耐腐蚀性越强。扫描电子显微镜观察最佳工艺条件下制备的镀层形貌。结果与结论：两种软磁合金表面的6价铬镀层硬度和厚度均大于3价铬镀层，且6价铬镀层相对更均匀，说明电镀6价铬可以明显提高铁镍软磁合金和铁铬钼软磁合金的耐腐蚀性。当基材为铁铬钼软磁合金时，电镀6价铬的最佳工艺为电流密度45 A/dm2，电镀时间为60 min；电镀3价铬的最佳工艺为电流密度20 A/dm2，电镀时间为30 min。当基材为铁镍软磁合金时，电镀6价铬的最佳工艺条件为电流密度35 A/dm2，电镀时间为60 min；电镀3价铬的最佳工艺条件为电流密度20 A/dm2，电镀时间为40 min。
배경：목전주요통과도락법제고연자합금적항부식성능。목적：채용단인소실험법학정철락목연자합금화철얼연자합금표면도락적최가공예조건，제고기항부식능력。방법：주조20 mm×20 mm×2 mm적방편상철락목합금화철얼합금각12편，표면경마광、포광、활화제활화후진행도락，채용단인소실험법，선인소위전도류형(분위6개락화3개락)、전류밀도(15，20，25，35，40，45 A/dm2)화전도시간(30，40，60 min)，고사지표위도층경도화후도，경도화후도치월대도층적내부식성월강。소묘전자현미경관찰최가공예조건하제비적도층형모。결과여결론：량충연자합금표면적6개락도층경도화후도균대우3개락도층，차6개락도층상대경균균，설명전도6개락가이명현제고철얼연자합금화철락목연자합금적내부식성。당기재위철락목연자합금시，전도6개락적최가공예위전류밀도45 A/dm2，전도시간위60 min；전도3개락적최가공예위전류밀도20 A/dm2，전도시간위30 min。당기재위철얼연자합금시，전도6개락적최가공예조건위전류밀도35 A/dm2，전도시간위60 min；전도3개락적최가공예조건위전류밀도20 A/dm2，전도시간위40 min。
BACKGROUND:Chroming can improve the corrosion resistance of soft magnetic aloys. OBJECTIVE:To identify the optimal chroming conditions of two soft magnetic aloys, Fe-Cr-Mo and Fe-Ni, so as to improve their corrosion resistance. METHODS:Twelve pieces of square-shaped Fe-Cr-Mo and Fe-Ni soft magnetic aloys were casted in the size of 20 mm×20 mm×2 mm. After sanding and polishing, chrome plating was performed on these specimens and the coating thickness and hardness were measured. The selection factors included electroplate type (hexavalent chromium and trivalent chromium), current density (15, 20, 25, 35, 40, 45 A/dm2) and electroplating time (30, 40, 60 minutes). The optimal chroming conditions were determined by one-factor experimental method and the chrome plating was observed under a scanning electron microscope. RESULTS AND CONCLUSION:Cr6+ coating was significantly better than Cr3+ coating in the aspects of hardness, thickness and uniformity, indicating Cr6+ coating can significantly improve the corrosion resistance of Fe-Cr-Mo and Fe-Ni aloys. For Fe-Cr-Mo soft magnetic aloy, the optimal conditions of Cr6+ coating were as folows: current density of 45 A/dm2 and electroplating time of 60 minutes; the optimal conditions of Cr3+ coating were as folows: current density of 20 A/dm2 and electroplating time of 30 minutes. For Fe-Ni soft magnetic aloys, the optimal conditions of Cr6+ coating were as folows: current density of 35 A/dm2 and electroplating time of 60 minutes; the optimal conditions of Cr3+ coating were as folows: current density of 20 A/dm2 and electroplating time of 40 minutes.