Preparation method for corrosion-resistance ductile malleable iron material

Abstract

The invention belongs to the technical field of material preparation, particularly to a preparation method for a corrosion-resistance ductile malleable iron material. A molding apparatus used in the method comprises a base plate; a rotation shaft is rotatably mounted at the top end of the base plate; a drive motor is fixed at the top end of the base plate; a rotation wheel is fixed at the top endof the drive motor; a rotation ring is fixed on the surface of the rotation shaft; a synchronous belt is movably connected between the rotation wheel and the rotation ring; a placement table is fixedat the top end of the rotation shaft; a placement tank is provided at the top end of the placement table, and is used for placing a casting mold; and two brackets are fixed on the side walls of the placement table. A flaky corrosion resistance layer is pressed in the invention, is distributed on the surface of the ductile malleable iron material, and is fused with the ductile malleable iron material together; a protection effect can still be achieved when the ductile malleable iron material is forged; and moreover, the use of nickel and chromium is reduced, the use cost is reduced, and the characteristics of the ductile malleable iron material are retained to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a preparation method of corrosion-resistant nodular malleable cast iron material. Background technique [0002] Malleable cast iron is a cast iron made by casting molten iron with a certain chemical composition into a white blank, and then annealed. It has high strength, plasticity and impact toughness, and can partially replace carbon steel. Malleable cast iron is a high-strength and tough cast iron obtained from white cast iron through graphitization annealing. It has high strength, plasticity and impact toughness, and can partially replace carbon steel. Compared with gray cast iron, malleable cast iron has better strength and plasticity, especially better low-temperature impact performance, and better wear resistance and vibration damping than ordinary carbon steel. Because of its certain plasticity and toughness, this kind of cast iron is commonly known as mall...

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Problems solved by technology

[0003] There have also been some technical solutions for the preparation of malleable iron materials in the prior art, such as a Chinese patent with application number 2011100074675, which discloses a corrosion-resistant nodular malleable iron material and its preparation method. Steel wire and iron wire and nodular malleable iron Combined to form a good metallurgical bond, low carbon steel wire and iron wire are distributed in the ductile iron, which has a good strengthening and toughening effect on the material, and the ductile malleable iron molten iron enters the mold cavity and contacts the nickel on the surface of the steel wire and iron wire Finally, the Ni and Cr on the surface of the wire melt into the molten iron, and the C in the molten iron reacts with Si and Ni and Cr on the surface of the steel wire and iron wire to form special compounds Ni3C, Ni3Si, Cr3Si and Cr23C6 with higher hardness than cementite. This special compound further improves the corrosion resistance of the material, but the special compound generated on the surface of the material is not uniform, which leads to the problem of uneven corrosion resistance of the material during use, which affects the overall use effect of the material. At the same time, the internal nickel and Chromium cannot be used, which wastes nickel and chromium. Accordingly, the present invention proposes a method for preparing corrosion-resistant ductile malleable iron material

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