Development of Chemical Conversion Coating for Blackening of a Grade of Stainless Steel Useful for Fabrication of Optical Devices

Abstract

An improved chemical conversion coating process for blackening of a specific type of stainless steel has been developed. In this process a new optimized bath compositions and operating procedures were set-up by using different trial & error methods to get the desired coating. The technique is also developed for the simplicity, and economical aspect than other techniques. Characterization of coating is done in terms of morphology, optical, hardness by using SEM, Spectrophotometer, and Indentation Hardness methods. Sea-water and temperature variations effects on the coated surface are also studied.

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

“…The chemical conversion coating process has found extensive use in blackening metals such as cast iron, copper, stainless steel (SS), magnesium, aluminum alloys, zinc alloys, and so on due to their excellent corrosion resistance, appearance, adhesion, oxidation resistance, wear resistance, scratch resistance, and hardness. [1][2][3][4] Chemical conversion coating is a simple and cost-effective method adopted for surface modification of steel substrates that are rapidly being employed in a variety of applications. 5,6 A chemical conversion coating is formed on the substrate surface by the reaction of metal with the help of an oxidizing medium such as air, molten salts, and solutions containing alkaline salts.…”

“…3 O 4 ) coating on surgical-grade 410 grade SS. An L9 OA was performed to analyze the average percentage reflectance as an output characteristic.…”

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

“…Martensitic stainless steel of grade 410, 420A, 420B, and 420C has been widely used for the manufacturing of cutting and non-cutting surgical instruments [1,2]. In addition to biocompatibility, martensitic stainless steel has high strength, hardness, stiffness, rigidity, resilient, and non-corrosive nature [3].…”