Characterization and In Vitro Studies of Low Reflective Magnetite (Fe3O4) Thin Film on Stainless Steel 420A Developed by Chemical Method

Abstract

Stainless steel has been the most demanded material for surgical utensil manufacture due to superior mechanical properties, sufficient wear, and corrosion resistance. Surgical grade 420A stainless steel is extensively used for producing sophisticated surgical instruments. Since these instruments are used under bright light conditions prevalent in operation theatres, the reflection from the material is significant which causes considerable strain to the eye of the surgeon. Surgical instruments with lower reflectance will be more efficient under these conditions. A low reflective thin -film coating has often been suggested to alleviate this inadmissible difficulty. This paper reports the development of an optimum parametric low reflective magnetite coating on the surface of SS 420A with a black color using chemical hot alkaline conversion coating technique and its bioactivity studies. Coating process parameters such as coating time, bath temperature, and chemical composition of bath are optimized using Taguchi optimization techniques. X-ray photoelectron spectroscopy (XPS) analysis was used to identify the composition of elements and the chemical condition of the developed coating. Surface morphological studies were accomplished with a scanning electron microscope (SEM). When coupled with an energy-dispersive X-ray analysis (EDAX), compositional information can also be collected simultaneously. Invitro cytotoxicity tests, corrosion behavior, the effect of sterilization temperature on adhesion property, and average percentage reflectance (R) of the developed coating have also been evaluated. These results suggest adopting the procedure for producing low reflective conversion coatings on minimally invasive surgical instruments produced from medical grade 420A stainless steel.

Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

“…It is mainly categorized according to the required output characteristics which divided into three types: Smaller-the-Better, Larger-the-Better, or Nominal-the-Better. [27][28][29] Corrosion current (I corr ) should follow Smaller-the-Better characteristics, since lower I corr value is mean to obtain a better corrosion resistance coating on low Sncoated steel. Meanwhile, analysis of variance (ANOVA) and regression analysis were also conducted.…”

Taguchi method and Box-Behnken design approach for process parameter optimization of magnetite (Fe3O4) coating developed on stainless steel 410 grade by hot alkaline treatment

“…In former studies conducted conversion coating methodology was adopted for coating various grades of SS (SS 310, SS 420A). 51,52 The measured average percentage reflectance values of SS 310 and SS 420A were measured as 11.29% and 7.546%, respectively. In this study, the average percentage of reflectance value was observed to be 8.38%, in the visible region.…”

Coatings made from chemicals: A review

“…Black coloured magnetite (Fe 3 O 4 ) coating of optimum functionality on the surface of SS 420A has been developed in hotalkaline medium as given in the eqs (15‐17). [ 15,145 ] …”

“…So, a thin coating with low reflection on the instruments is proposed to overcome the serious problem. Black coloured magnetite (Fe3O4) coating of optimum functionality on the surface of SS 420A has been developed in hotalkaline medium as given in the eqs (15)(16)(17). [15,145] 4Fe + NaNO3 + 5NaOH → 3Na2FeO2 + FeO + H2O + NH3…”

“…[6,7] Table 1 demonstrates several very significant reported works on chemical coating with their substrates. [10,15] Coating provides suitable surface for paint to stick to all around. Coating assists paint to be bonded mechanically to the metal surface preventing the chance of delamination or flaking from the steel surface.…”