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A kind of corrosion-resistant cast iron alloy and preparation method thereof

A technology of corrosion-resistant cast iron and alloy, applied in the field of corrosion-resistant cast iron alloy and its preparation, and can solve the problems of poor corrosion resistance and the like

Active Publication Date: 2021-12-03
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a corrosion-resistant cast iron alloy to solve the problem of poor corrosion resistance of existing cast iron alloys

Method used

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  • A kind of corrosion-resistant cast iron alloy and preparation method thereof
  • A kind of corrosion-resistant cast iron alloy and preparation method thereof
  • A kind of corrosion-resistant cast iron alloy and preparation method thereof

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Effect test

Embodiment 1

[0027] The corrosion-resistant cast iron alloy of this embodiment is composed of the following elements by mass percentage: C: 2.167%, Cr: 27.38%, Mo: 0.6387%, Si: 0.9637%, Mn: 0.7628%, N: 0.58%, Al: 1.368 %, P≤0.01%, S≤0.01%, rare earth element Ce: 0.1%, and the balance is iron and unavoidable impurities.

Embodiment 2

[0029] The corrosion-resistant cast iron alloy of this embodiment is composed of the following elements by mass percentage: C: 2.241%, Cr: 26.53%, Mo: 0.7521%, Si: 1.036%, Mn: 0.6853%, N: 0.52%, Al: 1.246 %, P≤0.01%, S≤0.01%, rare earth element Ce: 0.15%, and the balance is iron and unavoidable impurities.

Embodiment 3

[0031] The corrosion-resistant cast iron alloy of this embodiment is composed of the following elements by mass percentage: C: 2.347%, Cr: 25.07%, Mo: 0.6871%, Si: 1.047%, Mn: 0.5946%, N: 0.46%, Al: 1.179 %, P≤0.01%, S≤0.01%, rare earth element Ce: 0.20%, and the balance is iron and unavoidable impurities.

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Abstract

The invention relates to a corrosion-resistant cast iron alloy and a preparation method thereof, belonging to the field of cast iron alloys. The corrosion-resistant cast iron alloy is composed of the following elements by mass percentage: N: 0.2‑0.6%, C: 2.1‑2.5%, Cr: 23‑28%, Mo: 0.5‑0.8%, Si: 0.9‑1.2%, Mn: 0.5‑0.8%, Al: 1.0‑1.4%, P≤0.01%, S≤0.01%, rare earth elements: 0.1‑0.3%, and the balance is iron and unavoidable impurities. The corrosion-resistant cast iron alloy provided by the invention contains elements such as chromium, nitrogen, aluminum, etc. Nitrogen can be enriched at the interface between the metal and the oxide film and on the active surface of the metal to slow down electrochemical corrosion; aluminum can form and expand the ferrite phase zone, which promotes the formation of α-Fe single phase and improves the corrosion resistance of the matrix; the combination of various elements can significantly slow down the corrosion of the material and improve the corrosion resistance.

Description

technical field [0001] The invention belongs to the field of cast iron alloys, in particular to a corrosion-resistant cast iron alloy and a preparation method thereof. Background technique [0002] At present, in the machinery and equipment of petrochemical, aerospace, water conservancy and electric power industries, various iron castings such as pump bodies, valves, pipes, and wing wheels of hydraulic generators often work in seawater, corrosive media, and atmospheric conditions. , often fail due to corrosion during service. [0003] At present, the widely used corrosion-resistant cast iron material is mainly high chromium cast iron. However, there is serious interphase corrosion in Cr-based white cast iron, and the weight loss caused by interphase corrosion accounts for a relatively high proportion of the total weight loss. The driving force of interphase corrosion is the potential difference between the matrix phase and the carbide phase. During the corrosion process, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/06C22C37/10C22C33/08C21D5/00
CPCC21D5/00C22C33/08C22C37/06C22C37/10
Inventor 徐流杰魏世忠路富刚王方方周玉成潘昆明李秀青李继文毛丰王晓东陈冲司岸恒熊美张国赏张程靳东亮任永鹏
Owner HENAN UNIV OF SCI & TECH