Optimal chroming conditions of two soft magnetic alloys as determined by one-factor experimental method

doi:10.3969/j.issn.2095-4344.2015.43.015

Abstract

Abstract:

BACKGROUND: Chroming can improve the corrosion resistance of soft magnetic alloys.

OBJECTIVE: To identify the optimal chroming conditions of two soft magnetic alloys, 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 alloys 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 alloys. For Fe-Cr-Mo soft magnetic alloy, the optimal conditions of Cr⁶⁺ coating were as follows: current density of 45 A/dm² and electroplating time of 60 minutes; the optimal conditions of Cr³⁺ coating were as follows: current density of 20 A/dm² and electroplating time of 30 minutes. For Fe-Ni soft magnetic alloys, the optimal conditions of Cr⁶⁺ coating were as follows: current density of 35 A/dm² and electroplating time of 60 minutes; the optimal conditions of Cr³⁺ coating were as follows: current density of 20 A/dm² and electroplating time of 40 minutes.
中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Alloys, Chromium, Corrosion, Tissue Engineering

Jiang Rui, Nie Er-min, Zhang Chun-yuan, Zeng Jin-di, Tan Ji-zhou. Optimal chroming conditions of two soft magnetic alloys as determined by one-factor experimental method[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(43): 6966-6970.

Figures/Tables 3

References

[1] Sun SY,Zhao YM,Zhang YM,et al.The research of using TiN nanometer film to improve the anticorrosive property of FeCrMo alloy.Zhonghua Kou Qiang Yi Xue Za Zhi.2003; 38(5):387-389.

[2] 张书垣,朱智敏,巢永烈.磁性附着体衔铁的耐腐蚀性研究[J].中国组织工程研究,2012,16(38):7151-7155.

[3] 赵铱民,陈文.齿科用铁铬钼软磁合金耐腐蚀性的电化学方法测定[J].中华口腔医学杂志,1994,29(2):119.

[4] Hai K,Sawase T,Matsumura H,et al.Corrosion resistance of a magnetic stainless steel ion-plated with titanium nitride.J Oral Rehabil.2000;27(4):361-366.

[5] Nakamura K,Takada Y,Yoda M,et al.Galvanic corrosion of ferritic stainless steels used for dental magnetic attachments in contact with an iron-platinum magnet.Dent Mater J.2008; 27(2)203-210.

[6] Lavrentiev MY,Wróbel JS,Nguyen-Manh D,et al.Magnetic and thermodynamic properties of face-centered cubic Fe-Ni alloys. Phys Chem Chem Phys.2014;16(30): 16049-16059.

[7] Kojima T,Ogiwara M,Mizuguchi M,et al.Fe-Ni composition dependence of magnetic anisotropy in artificially fabricated L₁ 0-ordered FeNi films.J Phys Condens Matter. 2014;26(6): 064207.

[8] Ekholm M,Zapolsky H,Ruban AV,et al.Influence of the magnetic state on the chemical order-disorder transition temperature in Fe-Ni permalloy.Phys Rev Lett. 2010;105(16): 167208.

[9] 姜瑞,聂二民,张春元,等.新型材料磁性附着体设计模型的建立[J].中国组织工程研究,2015,19(3):460-464.

[10] 张雪辉.电沉积Ni-W合金镀层的制备、结构及其性能研究[D].江西理工大学,2010.

[11] 余细波.电沉积制备Cu-Co合金镀层的工艺研究及性能表征[D].兰州理工大学,2011.

[12] Bayramoglu M,Onat B,Geren N.Statistical Optimization of Process Parameters to Obtain Maximum Thickness and Brightness in Chromium Plating.J Mater Proc Technol.2008; 203(1-3):277-279.

[13] El Sharif M,Chisholm CV.Characteristics of Electrodeposited Chromium. Trans IMF. 1997;75(6):208-212.

[14] El Sharif M.Electrodeposition Acceptable Process from Electrodepositionof Hard Chromium (Ⅲ) Electrolyte.Trans IMF.1999;77(4):139-144.

[15] Low CTJ,Wills RGA,Walsh FC.Electrodeposition of composite coatings containing nanoparticles in a metal deposit.Surf Coat Technol.2006;201(1-2):371-383.

[16] Vaezi MR,Sadrnezhaad SK,Nikzad L.Electrodeposition of Ni-SiC nano-composite coatings and evaluation of wear and corrosion resistance and electroplating characteristics. Physicochem and Eng Aspects,2008,315(1-3):176-182.

[17] Cai C,Zhu XB,Zheng GQ,et al. Electrodeposition and characterization of nano-structured Ni-SiC composite films. Surf Coat Technol.2011;205(5):3448-3454.

[18] Benea L,Bonora PL,Birello A,et al.Wear corrosion properties of nano-structured SiC-nickel composite coatings obtained by electroplating.Wear.2001;249(10-11):995-1003.

[19] Chen WW,Gao W.Sol-enhanced electroplating of nanostructured Ni-TiO2 composite coatings-The effects of sol concentration on the mechanical and corrosion properties. Electrochimica Acta.2010;55(22):6865-6871.

[20] 张书垣,朱智敏,巢永烈.磁性附着体衔铁的耐腐蚀性研究[J].中国组织工程研究,2012,16(38):7151-7155.

[21] 曾志翔,王立平,陈丽,等.三价铬电镀硬铬及镀层性能的研究[J].电镀与环保,2006,26(4):11-13.