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Method for quantitatively evaluating coverage rate of zinc phosphating film of cold-rolled automobile steel

A quantitative evaluation, automotive steel technology, applied in the coverage measurement evaluation, phosphating film compactness field, can solve the problem of non-professionals difficult to complete, the operation method process is complicated, etc. problem, to achieve the effect of improving the performance detection and corrosion resistance detection, and the calculation method is simple and fast

Pending Publication Date: 2022-06-17
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent document CN112595736A discloses a method for quantitatively evaluating the compactness of phosphating film, which uses Adobe Photoshop CS6 special software to quantitatively evaluate the compactness of phosphating film, the operation method process is complicated, and it is difficult for non-professionals to complete
None of the above detection methods can quickly and quantitatively evaluate the density and coverage of phosphating crystals.

Method used

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  • Method for quantitatively evaluating coverage rate of zinc phosphating film of cold-rolled automobile steel
  • Method for quantitatively evaluating coverage rate of zinc phosphating film of cold-rolled automobile steel
  • Method for quantitatively evaluating coverage rate of zinc phosphating film of cold-rolled automobile steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Cut the cold-rolled automobile sheet after zinc phosphating treatment into samples with a length of 20mm and a width of 15mm, and clean the surface of the samples with alcohol.

[0020] 2. The phase quantification function of the X-ray diffractometer was used to determine the phase composition of the phosphating film on the surface of the cold-rolled automobile steel sample. The working conditions were Cu target, voltage 40kV, current 40mA, continuous scanning, each step for 20.4s, step Length 0.026° / step.

[0021] 3. The phase test results are as follows figure 1 As shown, the phosphating film coverage is calculated from this, and the phosphating film coverage = (the third generation of zinc phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O) Percentage / 3rd Generation Zinc Phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O+Fe) percentage, the results are shown in Table 1 below.

Embodiment 2

[0023] 1. Cut the cold-rolled automobile sheet after zinc phosphating treatment into samples with a length of 20mm and a width of 15mm, and clean the surface of the samples with alcohol.

[0024] 2. The phase quantification function of the X-ray diffractometer was used to determine the phase composition of the phosphating film on the surface of the cold-rolled automobile steel sample. The working conditions were Cu target, voltage 40kV, current 40mA, continuous scanning, each step for 20.4s, step Length 0.026° / step.

[0025] 3. The phase test results are as follows figure 2 As shown, calculate the phosphating film coverage, the phosphating film coverage = (the third generation of zinc phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O) Percentage / 3rd Generation Zinc Phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O+Fe) percentage, the results are shown in Table 1 below.

Embodiment 3

[0027] 1. Cut the cold-rolled automobile sheet after zinc phosphating treatment into samples with a length of 20mm and a width of 15mm, and clean the surface of the samples with alcohol.

[0028] 2. The phase quantification function of the X-ray diffractometer was used to determine the phase composition of the phosphating film on the surface of the cold-rolled automobile steel sample. The working conditions were Cu target, voltage 40kV, current 40mA, continuous scanning, each step for 20.4s, step Length 0.026° / step.

[0029] 3. The phase test results are as follows image 3 As shown, calculate the phosphating film coverage, the phosphating film coverage = (the third generation of zinc phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O) Percentage / 3rd Generation Zinc Phosphate Zn 3 (PO 4 ) 2 ·4H 2 O + iron zinc phosphate Fe 2 Zn(PO 4 ) 2 ·4H 2 O+Fe) percentage, the results are shown in Table 1 below.

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Abstract

The invention discloses a method for quantitatively evaluating the coverage rate of a zinc phosphating film of cold-rolled automobile steel. The method comprises the following steps: (1) determining the phase composition of the phosphating film on the surface of a cold-rolled automobile steel sample by adopting the phase quantitative function of an X-ray diffractometer; and (2) according to the detection result of the step (1), the coverage rate of the phosphating film is calculated, and the coverage rate of the phosphating film is equal to (zinc triphosphate Zn3 (PO4) 2.4 H2O + zinc iron phosphate Fe2Zn (PO4) 2.4 H2O) percentage / zinc triphosphate Zn3 (PO4) 2.4 H2O + zinc iron phosphate Fe2Zn (PO4) 2.4 H2O + Fe) percentage. According to the method, the coverage rate of the phosphating film in the target phosphating area can be directly calculated, measurement with a ruler is not needed, and a benchmarking map and a calculation method are simple, convenient and rapid.

Description

technical field [0001] The invention belongs to the technical field of measurement and evaluation of the compactness and coverage of phosphating films, and particularly relates to a method for quantitatively evaluating the coverage of zinc-based phosphating films of cold-rolled automobile steel. Background technique [0002] At present, the cold-rolled automobile sheet enters the painting workshop after stamping and welding for phosphating and electrophoresis. The quality of the phosphating of the automobile sheet directly affects the performance and corrosion resistance of the subsequent processes such as electrophoresis. The so-called phosphating is the process of chemically treating metal parts in a solution containing phosphate to form a phosphate protective film (phosphating film) that is insoluble in water on the metal surface. Phosphating treatment is an important method to prevent metal corrosion. [0003] Coating is like building a wall. The quality of the previous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20
CPCG01N23/20
Inventor 杨维宇刘恩泽张晓磊董磊王亚男勤牧
Owner BAOTOU IRON & STEEL GRP
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