Method for detecting low-temperature brittleness of zinc anode ribbon

A low-temperature brittleness and detection method technology, which is applied in the direction of testing the strength of materials by applying a stable bending force, can solve the problems of anode failure, brittle fracture, and large difference between ductility and brittleness, etc., and achieves simple methods, easy operation, and simple measurement Effect

Inactive Publication Date: 2010-06-09
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

In the production process, for the convenience of transportation, the strip is usually wound into a circle for packaging, and it needs to be unfolded for construction during use, and it is prone to brittle fracture in a low temperature environment, resulting in anode failure
However, due to the difference in production process and technology, the toughness and brittleness of the same specification of zinc strips vary greatly under the same temperature environment.

Method used

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  • Method for detecting low-temperature brittleness of zinc anode ribbon
  • Method for detecting low-temperature brittleness of zinc anode ribbon
  • Method for detecting low-temperature brittleness of zinc anode ribbon

Examples

Experimental program
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Effect test

Embodiment 1

[0031] According to the application temperature range of the zinc anode belt, the test temperature range is set to -20~20°C, and the test temperature range is divided into 5 test temperature points, and the interval between each test temperature point is 10°C, and each test temperature point is corresponding , Take Type IIB type sacrificial zinc anode strip samples (type B zinc anode strip is diamond-shaped in cross section, and the diagonal length is 15.88mm×22.23mm). According to the number of samples tested at each test temperature is 3, prepare 15 samples of corresponding specifications and quantities.

[0032] The cooling medium in the low-temperature tank of the cooling device is air, and the cold source is a refrigerator. According to the test temperature, the temperature is lowered by manually adjusting the temperature of the cold source, that is, the refrigerator. Place 15 samples in the uniform temperature zone of the low-temperature tank to cool, and keep an approp...

Embodiment 2

[0043] Embodiment 2 except that the sample is a TypeIIC type zinc anode strip (the cross section of the C type zinc anode strip is a rhombus, and the length of the diagonal line is 12.7mm * 14.29mm), the cold source is liquid nitrogen, and the holding time is 4 hours, all the others are Same as Example 1. See Table 3 for the maximum bending diameter of the sample at each test temperature point of Example 2.

[0044] Table 3 Bending diameter test results of Type II C zinc anode strips at different temperatures

[0045]

[0046] Quantitatively judge the maximum bending diameter of Type II C zinc anode strips at different temperatures according to the above table.

[0047] According to the test results of Example 1 and Example 2, the maximum bending diameters of different types of zinc anode strips at different temperatures can be compared and analyzed, which is intuitive and easy to understand, and can provide theoretical guidance for actual production and engineering applic...

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Abstract

The invention relates to a method for detecting low-temperature brittleness of a zinc anode ribbon, which comprises the following steps: (1) determining a plurality of test temperature points, and preparing the corresponding specification and number of samples; (2) cooling the samples for heat preservation for 4 to 5 hours; (3) measuring the maximum bending diameter of the samples at a certain test temperature point; and (4) changing the temperature of a cooling medium to the other test temperature point within the test temperature range, measuring the maximum bending diameter of the samples at the temperature, and establishing a temperature (T)-maximum bending diameter (phi) database according to the maximum bending diameter under each test temperature point. The method is simple, easy to operate, and simple and direct and quick to measure; and the ductile-brittle transition temperature range of the zinc anode ribbon is judged quantificationally according to the database, and the method is visual and easy to understand, provides theoretical guidance for actual production and engineering application, and has important practical significance.

Description

technical field [0001] The invention relates to a method for detecting low-temperature brittleness of zinc anode strips. During the installation and construction process of the zinc anode strip in a low temperature environment, it is prone to brittle fracture, which affects the protection effect of the protected components. This method is a test method proposed for the low temperature brittleness of zinc anode strips. Background technique [0002] At present, the continuous strip zinc anode used in cathodic protection technology is an ideal sacrificial anode material, which is widely used in the protection of structures such as sea water, fresh water and underground pipelines, and has developed rapidly in manufacturing technology and application technology. In the production process, for the convenience of transportation, the strip is usually wound into a circle for packaging, and it needs to be unfolded for construction during use, and it is prone to brittle fracture in a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 侯德龙沈健李彦利李德富宋月清
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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