Process of combining ceramic layer onto surface of iron base material

Abstract

The present invention proposes a combination of hot-dip aluminum plating technology and aluminum anodic oxidation technology to composite the ceramic layer on the surface of iron-based materials, that is, to carry out conventional degreasing (grease) treatment on iron-based materials, and then use hydrochloric acid solution to degrease Rust treatment, wash with cold water after rust removal. After the above-mentioned iron-based material is boiled, it is soaked in 6-8% potassium fluozirconate aqueous solution for 2-10 minutes or directly painted. After soaking or brushing, take it out and dry it at 350-450°C for 20-30 minutes. After drying, immerse in pure aluminum liquid for 10 seconds to 2 minutes, and then use aluminum anodic oxidation technology to oxidize all or part of the aluminum on the surface of the iron-based material into Al2O3 to obtain a ceramic layer composite iron-based material with a surface layer of Al2O3. The technology of the present invention has strong adaptability, can be applied to various types of workpieces such as wires, nets, plates, rods, tubes, etc., and can obtain high-temperature oxidized ceramic layers with different thicknesses; the alumina obtained by anodic oxidation has high hardness and High temperature resistance, can effectively prevent the diffusion of iron into aluminum.

Description

technical field [0001] The invention relates to a method for compounding a ceramic layer on the surface of an iron-based material. Specifically, the present invention relates to a technical method for compounding a ceramic layer on the surface of an iron-based material by combining the hot-dip aluminum plating technology with the aluminum anodic oxidation technology. Background technique [0002] Iron-based materials have strong and tough characteristics, so they are widely used in the production of tools and filter screens for aluminum alloy smelting. However, when iron-based materials are in contact with aluminum alloy solutions at high temperatures, they are easily dissolved into aluminum to form brittle iron-aluminum phases, which deteriorate the performance of aluminum alloy materials and increase production costs. For example, in the production process of aluminum alloy wheels, barbed wire is used as a filter in the pouring process. Since the filter used every time i...

AI Technical Summary

Problems solved by technology

The main protection method currently used is to apply paint to the surface of iron-based materials, which can reduce the direct contact between aluminum and iron-based materials to a certain extent. limited protection

Xie Shiyue et al. ("Research on Carbon Steel Hot Dip Aluminum Plating and Micro-arc Oxidation", Light Alloy Processing Technology, No. 9, 2003: 35-38) proposed a combination of hot-dip aluminum plating technology and micro-arc oxidation technology. method to obtain an oxide ceramic film on the surface of steel, but it is still difficult to control the film thickness