Abstract
Zinc electroplating was used to enhance corrosion resistance of porous metal injection molded 440C stainless steel. Controlled porosity was achieved by the powder space holder technique and by using sodium chloride as a space holder material. The internal pore structure of porous 440C was deposited by zinc using electroplating with three different electrolytes of zinc acetate, zinc sulfate, and zinc chloride. Our results show that all zinc depositions on porous 440C samples significantly improved corrosion resistance. The lowest corrosion was observed with zinc acetate at 30 wt.% porosity. The developed zinc coated porous 440C samples have potential in applications in corrosive environments.
Highlights
Molded Porous 440C Stainless SteelStainless steels are widely used in various applications, ranging from simple everyday items such as cutlery and kitchen equipment to highly complicated products in automotive and medical industries
This study focuses on the deposition of corrosion protective zinc particles into the internal pore structure of injection molded porous 440C via electrodeposition
The pore morphology of the Metal injection molding (MIM) fabricated porous stainless-steel structure was induced by the size and shape of the used space holder material crystals
Summary
Stainless steels are widely used in various applications, ranging from simple everyday items such as cutlery and kitchen equipment to highly complicated products in automotive and medical industries. Martensitic 440C is the strongest of the martensitic stainless-steel grades. This is due to the high carbon content (nominal composition 1.10 wt.%), along with the carbides present in the crystal structure [3,4]. The high carbon content comes with a drawback: The corrosion resistance of type 440C stainless steel is only average due to the carbide precipitation in the crystal structure despite a high chromium content (17.00 wt.%) [4,7,8]. The corrosion resistance of 440C is among the weakest of stainless-steel grades [8]
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