Preparation method for low alloy steel surface phosphating film

A surface phosphating and low-alloy steel technology, applied in phosphating, metal material coating process, etc., to achieve excellent corrosion resistance, simple pre-treatment process, and accelerated phosphating speed

Inactive Publication Date: 2016-05-25
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method that can make low-alloy steel reach nanometer size to homogenize the surface structur

Method used

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  • Preparation method for low alloy steel surface phosphating film
  • Preparation method for low alloy steel surface phosphating film
  • Preparation method for low alloy steel surface phosphating film

Examples

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Embodiment 1

[0033] (1) Nanoization of the surface of the workpiece: After the 16Mn steel is degreased, degreased, and SiC sandpaper is gradually polished to 800 mesh, the surface of the workpiece is treated by microbead strong shot peening. The diameter of the stainless steel projectile used for microbead strong shot peening is 0.10 mm, the spraying distance is 5.5cm, the spraying pressure is 1.0MPa, and the blasting time is 6min, such as figure 1 with figure 2 It can be seen that the grain refinement effect of 16Mn steel surface microbead strong shot peening is obvious, and the average grain size after refinement is only 60nm, while figure 2 The diffraction pattern in the figure is circular, indicating that the selected area is composed of polycrystals, which further proves that the surface of the 16Mn steel has achieved nanoscale grains.

[0034] (2) Workpiece pretreatment: place the workpiece treated in step (1) in a 80°C container containing 15g / LNaOH, 10g / LNaCO 3 and 10g / LNaSiO ...

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Abstract

The invention discloses a preparation method for a low alloy steel surface phosphating film. The preparation method includes the steps of workpiece surface nanocrystallization, workpiece pretreatment, phosphating solution preparation, phosphating treatment, phosphating film aftertreatment and the like. When the surface of a workpiece is subjected to nanocrystallization, the surface of the workpiece is treated through microsphere powerful shot blasting, the grain size of the workpiece is on a nano scale, the diameter of adopted stainless steel shots ranges from 0.08 mm to 0.15 mm, the blasting distance ranges from 5.5 cm to 10 cm, the blasting pressure ranges from 0.8 MPa to 1.2 MPa, and the shot blasting time ranges from 5 min to 10 min. According to the preparation method for the low alloy steel surface phosphating film, the steel substrate is subjected to surface microsphere powerful shot blasting nanocrystallization, the metal surface structure is uniform, the metal surface is activated, the phosphating speed of low alloy steel is increased, formation of the phosphating film is promoted, the prepared phosphating film is dense and uniform and has excellent corrosion resistance, salt water resistance performance tests on the phosphating film exceed 72 h and far exceed national standards, the pretreatment process is simple, the effect is remarkable, and high practicality is achieved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing a phosphating film on the surface of low alloy steel. Background technique [0002] Phosphating film has many excellent properties and can be used for protection, electrical insulation, wear resistance, cold forming, etc. It can also be used for protection between processes and the bottom layer of organic films such as paint and powder. Low alloy steel due to the addition of a small amount of alloy elements , has better mechanical properties than ordinary carbon steel, but its corrosion resistance is still not as good as that of stainless steel, and protective treatment is required during use, and due to the presence of elements such as Cr and Ni, the ferrite phase and carburization are reduced The activity of the bulk phase seriously affects the phosphating process of low-alloy steel, causing problems such as slowing down the phosphating sp...

Claims

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Application Information

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IPC IPC(8): C23C22/78C23C22/36C25D5/36C25D11/36
CPCC23C22/78C23C22/362C25D5/36C25D11/36
Inventor 张留艳揭晓华郑琼彬
Owner GUANGDONG UNIV OF TECH
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