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Method for rapidly evaluating dry-wet alternate marine environment corrosion of polyurethane elastomer coating

A polyurethane elastomer, marine environment technology, applied in weather resistance/light resistance/corrosion resistance, analytical materials, measuring devices, etc., can solve problems such as high cost, short test cycle, base metal corrosion, etc., to achieve accurate evaluation results, test The effect of cycle shortening

Inactive Publication Date: 2020-04-03
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the continuous dry-wet cycle, water enters the polyurethane coating or the coating loses water, resulting in the volume expansion of the coating or the shrinkage of the surface, and stress is generated inside the coating. When the stress value accumulates to the critical value of the bonding strength between the coating and the substrate , the coating will peel off from the base metal, causing the base metal to corrode and affecting the service life of the equipment
[0005] At present, the environmental effect evaluation methods of polyurethane elastomer coatings at home and abroad are mainly divided into two categories: natural environment test and laboratory environment test. The evaluation results of natural environment test are reliable, but the test period is long, the cost is high, and the stability is not good.
Laboratory environmental tests mainly focus on single-factor accelerated tests, which have good reproducibility, short test period, and low cost. However, they can only assess the environmental effect under the condition of a single environmental factor, and cannot make comprehensive environmental adaptability for multi-factor coupling. Evaluation

Method used

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  • Method for rapidly evaluating dry-wet alternate marine environment corrosion of polyurethane elastomer coating
  • Method for rapidly evaluating dry-wet alternate marine environment corrosion of polyurethane elastomer coating
  • Method for rapidly evaluating dry-wet alternate marine environment corrosion of polyurethane elastomer coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking Xiamen as an example, the test condition of the damp heat test module is 60°C / 85%RH; the test medium of the salt water immersion test module is 3.5wt% sodium chloride aqueous solution, and the test temperature is 60°C; 0.51W / m 2 (340nm).

[0022] According to the meteorological data of Xiamen area in the past five years, the average annual temperature in Xiamen area is 18.7°C and the average annual humidity is 73%. According to the following formula, the equivalent conversion coefficient of the damp heat test is 0.084, and the corresponding laboratory damp heat aging time of one year in the natural environment is about 720h. In terms of the number of 12 test cycles, the damp heat time in each test cycle is 60h .

[0023]

[0024] In the above formula: K is the time conversion coefficient; θ 2 π 2 is the actual exposed temperature and humidity, θ 1 π 1 is the temperature and humidity of the accelerated test, θ 1 When ≤60°C, C=46.1.

[0025] The annual s...

Embodiment 2

[0052] Taking Xiamen as an example, the test condition of the damp heat test module is 40°C / 80%RH; the test medium of the salt water immersion test module is 3.5wt% sodium chloride aqueous solution, and the test temperature is 50°C; the radiation intensity in the xenon arc light aging module 0.51W / m 2 (340nm).

[0053] According to the meteorological data of Xiamen area in the past five years, the average annual temperature in Xiamen area is 18.7°C and the average annual humidity is 73%. According to the method of embodiment one, calculate the equivalent conversion coefficient of damp heat test to be 0.132, then the laboratory damp heat aging time corresponding to one year in the natural environment is about 1160h, to carry out 8 test cycle numbers, then in each test cycle The humid heat time is 145h.

[0054] The annual solar radiation energy in Xiamen area is about 5000MJ / m 2 , the calculated laboratory light aging time for simulating one year's solar radiation is 1010h, ...

Embodiment 3

[0064] Taking Xiamen as an example, the test condition of the damp heat test module is 50°C / 75%RH; the test medium of the salt water immersion test module is 3.5wt% sodium chloride aqueous solution, and the test temperature is 40°C; the radiation intensity in the xenon arc light aging module 0.51W / m 2 (340nm).

[0065] According to the meteorological data of Xiamen area in the past five years, the average annual temperature in Xiamen area is 18.7°C and the average annual humidity is 73%. According to the method of embodiment one, calculate the equivalent conversion coefficient of damp heat test to be 0.117, the laboratory damp heat aging time corresponding to one year in the natural environment is about 1022h, to carry out 24 test cycle numbers, then in each test cycle Damp heat time is 43h.

[0066] The annual solar radiation energy in Xiamen area is about 5000MJ / m 2 , according to the following formula, the laboratory photoaging time for simulating one year's solar radiat...

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Abstract

The invention discloses a method for rapidly evaluating dry-wet alternate marine environment corrosion of polyurethane elastomer coating. An acceleration test consists of three test modules, namely adamp-heat test module, a saline dipping test module and a xenon arc lamp light aging test module. The method comprises the following steps of converting annual average climate factors of the marine environment into test time of each test module by adopting an equivalent conversion method, providing 6 marshalling sequence for the test modules according to a test sequence, respectively carrying outa cycle period test, and characterizing a test result by using peel strength; taking a natural environment test result as a mother series, taking a laboratory acceleration test result as a child series, carrying out correlation analysis by adopting a grey correlation analysis method, and determining the test with the highest correlation degree as a laboratory rapid evaluation method. The method can reproduce the corrosion environment factors of the polyurethane elastomer coating in the service process, the evaluation result is reliable, and the test period is greatly shortened compared with anatural aging test.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of coating testing and evaluation, relates to environmental effect evaluation technology, in particular to a method for rapid evaluation of polyurethane elastomer coating dry-wet alternate marine environment corrosion. [0003] 2. Background technology [0004] When polyurethane elastomer coatings are used in high-humidity, high-salt spray marine environments, complex and irreversible chemical and physical changes will occur under the influence of humidity, sea water and ultraviolet light, resulting in a decline or deterioration of coating performance, especially dry and wet on sea and land Alternating cycles can easily cause damage to the protective coating. When seawater exists on the surface of the polyurethane coating, water and chloride ions enter the coating and under the coating through the micropores of the material over time, thereby destroying the protective performance of the polyurethane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N19/04
CPCG01N17/00G01N17/004G01N19/04
Inventor 谢可勇孙岩王登霞李晖王新波孟昭瑞冯典英段剑李倩倩
Owner SHANDONG NON METALLIC MATERIAL RES INST
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