Method for evaluating adhesion performance of coating of cold rolled automobile sheet

An adhesion, automotive board technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of difficulty in testing the "P ratio" value of phosphating films, errors in test results, and high requirements for operators to avoid problems. Loss, strong anti-interference ability, accurate test results

Inactive Publication Date: 2010-12-29
ANGANG STEEL CO LTD
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Problems solved by technology

However, this method needs to be completed by means of an X-ray diffractometer. X-rays have strong radiation hazards to the human body and have high requirements for operators, so most units cannot carry out this test; When the value is greater than 90%, due to the serious overlap of the two measured diffraction peaks, it is very difficult to test the "P ratio" value of the phosphating film, and the test results are prone to errors

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  • Method for evaluating adhesion performance of coating of cold rolled automobile sheet
  • Method for evaluating adhesion performance of coating of cold rolled automobile sheet

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Embodiment Construction

[0013] The specific embodiment of the present invention is described further below:

[0014] The adhesion performance of the coating was predicted by measuring the ratio of Zn element in the phosphating film on the surface of 7 kinds of cold-rolled automobile sheets to the composition of the entire phosphating film, as follows:

[0015] Step 1: Take 7 kinds of cold-rolled automobile sheets that have undergone zinc-based phosphating treatment but have not been painted, and cut them into templates with a side length (or diameter) of 10-50 mm, numbered 1-7 respectively.

[0016] Step 2: After the sample is cleaned and dried, put it into an energy dispersive spectrometer (EDS) for surface scanning, collect and test the characteristic energy of X-ray photons of various elements in the phosphating film on the surface of the sample, and calculate according to the collected test results The ratio of Zn element in the phosphating film on the surface of cold-rolled automobile sheet to t...

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Abstract

The invention discloses a method for evaluating the adhesion performance of a coating of a cold rolled automobile sheet phosphated by a zinc-system, which has the advantages of no harm to operators and simple and accurate evaluation. The method comprises steps of sample preparation, measurement and evaluation; the adhesion performance of the coating is predetermined by measuring the proportion of the Zn element in all phosphating film components in a phosphating film on the surface of the cold rolled automobile sheet; the proportion of the Zn element in all phosphating film components is determined by an energy dispersive spectrometer; when the proportion of the Zn element is less than or equal to 8 percent, the adhesion performance of the coating is excellent; when the proportion of the Zn element is more than 8 percent and less than or equal to 10 percent, the adhesion performance of the coating is good; when the proportion of the Zn element is more than 10 percent and less than or equal to 12 percent, the adhesion performance of the coating is general; and when the proportion of the Zn element is more than 12 percent, the adhesion performance of the coating is poor.

Description

technical field [0001] The invention relates to a method for evaluating the coating adhesion performance of a cold-rolled automobile sheet, in particular to a method for evaluating the adhesion performance of a cold-rolled automobile sheet coating treated with zinc-based phosphating. Background technique [0002] For cold-rolled automotive sheets, whether it is from the protective performance or the decorative performance, the adhesion performance of the coating must be evaluated. [0003] At present, there are 3 effective national standards for the determination of paint film adhesion, and there are 2 items commonly used in the test of coating adhesion performance of cold-rolled automobile sheets: 1. GB / T 1720-79 (89) "Determination of Paint Film Adhesion In this method, the model is fixed on a platform that can be moved back and forth. While the platform is moving, the stylus used as a circular motion cuts through the paint film and can draw lines of overlapping circular r...

Claims

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Application Information

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IPC IPC(8): G01N23/227
Inventor 陈义庆徐小连肖宇钟彬徐承明胡绍伟艾芳芳王永明王永
Owner ANGANG STEEL CO LTD
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