CN103335996A - Measuring method for weight of passivating film of galvanized plate - Google Patents

Abstract

The invention discloses a method for measuring the film weight of a passivation film on a galvanized sheet, comprising: measuring the Cr content in the passivation film of a standard sample by using a glow spectrum method, and comparing the Cr content with the standard Cr content of the standard sample , obtain the corresponding relation of described Cr content and described Cr standard content, wherein, the measuring method of the Cr standard content of described standard sample comprises adopting film weight tester; Use glow spectrometry to measure the Cr content of sample to be tested, utilize the According to the corresponding relationship, the Cr standard content of the sample to be tested is calculated. The method for measuring the weight of the passivation film on a galvanized sheet provided by the present invention uses the corresponding relationship between the Cr content and the Cr standard content, and only needs to measure the mass percentage content of the Cr element of the sample to be tested to obtain the The standard content of the Cr element in the template improves the measurement efficiency of the passivation film weight of the galvanized sheet.

Description

A method for measuring the weight of passivation film on galvanized sheet

technical field

The invention relates to a method for measuring the film weight of a passivation film, in particular to a method for measuring the film weight of a galvanized plate passivation film.

Background technique

The galvanized layer of the galvanized sheet is an anodic coating for the iron substrate, which can provide reliable electrochemical protection and is widely used in industrial production. However, the galvanized layer is extremely prone to corrosion in a humid environment, so surface passivation treatment is required to enhance its corrosion resistance. Therefore, the film weight of the passivation film on the surface of the galvanized sheet will directly affect its corrosion resistance. Generally speaking, a film weight tester is used to measure the film weight of the passivation film, and parameters and calculation formulas need to be input in advance in the instrument, while the parameters and The calculation formula requires the accumulation of a large amount of experimental data in the early stage, so there is a problem of low efficiency when using this test method for the film weight of the passivation film.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for measuring the weight of the passivation film on a galvanized sheet, which solves the problem of low efficiency in the current method for measuring the weight of the passivation film on a galvanized sheet.

In order to solve the above technical problems, the invention provides a method for measuring the weight of a passivation film on a galvanized sheet, comprising:

Step 1: Utilize glow spectrometry to measure the Cr content in the passivation film of the standard sample;

Step 2: comparing the Cr content with the Cr standard content of the standard sample to obtain the corresponding relationship between the Cr content and the Cr standard content, wherein the measurement method of the Cr standard content of the standard sample includes using Film weight tester;

Step 3: Determining the Cr content of the sample to be tested by using the glow spectrometry, and calculating the standard Cr content of the sample to be tested by using the corresponding relationship.

Further, this measurement method also includes:

The first step also includes: measuring the Cr content of more than two standard samples by using glow spectroscopy, and drawing the obtained Cr content data into a glow curve, and then fitting the glow curve to form a glow fitting curve;

The Cr standard content of the standard sample is drawn into a standard curve, and then the standard curve is fitted to form a standard fitting curve;

Wherein, the ordinate of the glow curve or standard curve is Cr element content.

Further, the step 3 also includes: measuring the Cr content of the sample to be tested by using glow spectroscopy, and calculating the Cr content of the sample to be tested through the corresponding relationship between the glow fitting curve and the standard fitting curve. Cr standard content.

Further, through the corresponding relationship between the glow fitting curve and the standard fitting curve, calculating the Cr standard content of the sample to be tested includes:

Take the Cr content of the sample to be tested as the ordinate value to draw a straight line parallel to the horizontal axis, intersect with the glow fitting curve at point one, and then draw a straight line parallel to the vertical axis through the point one, and connect with the The standard fitting curve intersects at point two, and the ordinate value of the point two is the Cr standard content of the sample to be tested.

The method for measuring the weight of the passivation film on a galvanized sheet provided by the present invention is to measure the Cr element percentage content in the passivation film of the standard sample by glow spectrometry, and then compare it with the Cr standard percentage content provided by the standard sample, which can be Calculate the corresponding relationship between the Cr element percentage content and the Cr standard percentage content, and then measure the mass percentage content of the Cr element of the sample to be tested, and use the corresponding relationship to obtain the film thickness of the passivation film on the galvanized sheet. Therefore, after obtaining the glow fitting curve and the standard fitting curve in the method for measuring the weight of the passivation film on a galvanized sheet provided by the present invention, it only needs to measure the mass percentage content of the Cr element of the sample to be tested, and then the sample to be tested can be obtained. The standard content of the Cr element improves the measurement efficiency of the passivation film weight of the galvanized sheet.

Description of drawings

Fig. 1 is the schematic diagram of glow curve, standard curve and fitting straight line thereof in the measurement method of galvanized sheet passivation film film weight that the embodiment of the present invention provides;

Fig. 2 to Fig. 4 are schematic diagrams of determining standard content of Cr element in passivation films of three test samples by using Fig. 1 .

Detailed ways

The method for measuring the weight of the passivation film on a galvanized sheet provided by the present invention is based on the fact that the main element for determining the weight of the passivation film is Cr, so the content of the Cr element is used to represent the weight of the passivation film. This measurement method overcomes the problem of low measurement efficiency due to the accumulation of a large amount of experimental data to form parameters and calculation formulas before the existing passivation film weight measuring instrument measures the film weight.

The measuring method of the passive film film weight of the galvanized sheet provided by the present invention is to measure the Cr element percentage content in the passivation film of the standard sample by glow spectrometry to draw the glow curve, and then compare with the Cr standard percentage that the standard sample provides. Comparing the sub-contents, the correction factor is calculated. Then measure the mass percentage content of the Cr element of the sample to be tested, and compare it with the standard curve to obtain the standard content of the Cr element, that is, the film thickness of the passivation film.

The method for measuring the weight of the passivation film on a galvanized sheet provided in the embodiments of the present invention includes:

Step 1: Use glow spectrometry to measure the Cr content in the passivation film of 8 standard samples. At the same time, the standard content of Cr in the passivation film of the standard sample is known, as shown in Table 1 below:

Table 1

,

Comparing the Cr element content of the standard sample measured by glow spectroscopy with the standard Cr standard content, the correction factor obtained is about 1.3, which proves that the method is authentic and feasible. Among them, the Cr standard in the passivation film of the standard sample The content is measured by a film weight tester;

Step 2: Draw the Cr content data of 8 standard samples measured by glow spectroscopy into a glow curve, and then fit the glow curve to form a glow fitting curve, see Figure 1; the 8 standard samples The standard content of the Cr element of the sample is drawn into a standard curve, and then the standard curve is fitted to form a standard fitting curve, see Figure 1, where the ordinate is the content of Cr in the passivation film, and the abscissa is used for determination The serial number of the standard sample;

Step 3: Determination of the Cr element mass percentage content of the sample to be tested by glow spectrometry, as shown in Table 2:

Table 2

;

Step 4: Calculate the standard Cr content of the sample to be tested through the corresponding relationship between the glow fitting curve and the standard fitting curve. Take the Cr content of the sample to be tested as the ordinate value to draw a straight line parallel to the horizontal axis, intersect with the glow fitting curve at point one, then draw a straight line parallel to the vertical axis through the point one, and connect with the The standard fitting curve intersects at point two, and the ordinate value of the point two is the Cr standard content of the sample to be tested.

Taking the sample to be tested with the sample number 1 in Table 2 as an example, take the Cr mass percentage Y=25.865mg/m ² , draw a straight line parallel to the horizontal axis, and intersect with the glow fitting curve to obtain intersection point 1, Draw a straight line perpendicular to the horizontal axis from the intersection point 1, and intersect with the standard fitting curve to obtain intersection point 2, then draw a straight line perpendicular to the vertical axis from the intersection point 2 and intersect with the vertical axis, read the ordinate of intersection point 2 to obtain the test The Cr standard content of the sample to be tested with sample number 1 is the film weight of the passivation film; Figures 2 to 4 are schematic diagrams of the determination process of the Cr standard content of the sample to be tested.

Table 3 is the standard content of Cr element obtained by using this measurement method for the sample to be tested:

table 3

.

Table 4 is the comparison of the Cr element standard content obtained by this measuring method with the Cr element standard content of the sample to be tested obtained by using a conventional film weight meter:

Table 4

According to the error display, the error of the film weight data of the passive film measured by the measurement method provided by the invention and the film weight data measured by the conventional film weight measuring instrument is about 1%, which belongs to the normal error range, and has no influence on the final data result. Influence.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (4)

1. A method for measuring the weight of a galvanized sheet passivation film, characterized in that, comprising: Step 1: Utilize glow spectrometry to measure the Cr content in the passivation film of the standard sample; Step 2: comparing the Cr content with the Cr standard content of the standard sample to obtain the corresponding relationship between the Cr content and the Cr standard content, wherein the measurement method of the Cr standard content of the standard sample includes using Film weight tester; Step 3: Determining the Cr content of the sample to be tested by using the glow spectrometry, and calculating the standard Cr content of the sample to be tested by using the corresponding relationship. 2. measuring method as claimed in claim 1, is characterized in that, The first step also includes: measuring the Cr content of more than two standard samples by using glow spectroscopy, and drawing the obtained Cr content data into a glow curve, and then fitting the glow curve to form a glow fitting curve; The Cr standard content of the standard sample is drawn into a standard curve, and then the standard curve is fitted to form a standard fitting curve; Wherein, the ordinate of the glow curve or standard curve is Cr element content. 3. measuring method as claimed in claim 2, is characterized in that, described step 3 also comprises: The Cr content of the sample to be tested is measured by glow spectroscopy, and the standard Cr content of the sample to be tested is calculated through the corresponding relationship between the glow fitting curve and the standard fitting curve. 4. measuring method as claimed in claim 3, is characterized in that, described by the corresponding relation of described glow fitting curve and standard fitting curve, calculates that the Cr standard content of described sample to be tested comprises: Take the Cr content of the sample to be tested as the ordinate value to draw a straight line parallel to the horizontal axis, intersect with the glow fitting curve at point one, then draw a straight line parallel to the vertical axis through the point one, and connect with the The standard fitting curve intersects at point two, and the ordinate value of the point two is the Cr standard content of the sample to be tested.

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