Method for rapidly evaluating performance of weather-resistant steel rust layer for transmission tower in coastal atmospheric environment

Abstract

The invention discloses a method for quickly evaluating the performance of a weather-resistant steel rust layer for a power transmission tower in a coastal atmospheric environment and belongs to the technical field of performance evaluation of the weather-resistant steel rust layer. According to the method, a corrosion simulation test is performed according to the service characteristics of a simulated coastal atmospheric corrosion environment; with the local corrosion of weather-resistant steel under the coastal atmospheric corrosion environment mainly applied, local corrosion general situation D2 and comprehensive corrosion general situation D1 are compared with each other, so that an evaluation basis index K value can be obtained; the corrosion tendency of a material is judged through local corrosion tendency observation; and therefore the measurement and evaluation time can be greatly shortened. Compared with an original weightlessness method which reflects comprehensive corrosion,the method of the invention enables a user to observe corrosion depth and the reflects the problem of local corrosion; the comprehensive corrosion measurement of the weightlessness method needs at least more than 10 days, while the method of the invention can be used for effectively shortening the evaluation period to be 2 or 4 days, and has the advantages of cheap equipment, simple operation andpopularization significance.

Description

technical field [0001] The invention relates to the technical field of performance evaluation of weather-resistant steel rust layers, in particular to a method for quickly evaluating the performance of weather-resistant steel rust layers for power transmission towers in coastal atmospheric environments. Background technique [0002] Power transmission towers are often protected by hot-dip galvanizing. Hot-dip galvanizing requires special rust removal, pickling, and galvanizing processes, which requires a large investment and serious pollution. Usually, the zinc liquid needs to be heated to about 450°C, which will release harmful gas and endanger human health, especially Cr in the galvanizing passivation solution. 6+ It is very harmful to the human body and the environment, and is very unfavorable to environmental protection. Cr 6+ Pollution control has become a worldwide problem, and has been restricted by the environmental protection department. [0003] Weathering steel ...

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Problems solved by technology

The disadvantage of this method is that the test period is long: according to TB / T2375, the "periodic immersion test + weight loss method" is adopted, the test period can be agreed to be 50, 75, and 100 hours, and the test material is a bare material without surface stabilization treatment, 100 hours The weekly immersion test reflects the generation speed of the rust layer on the weathering steel surface, but does not reflect the performance of the rust layer during long-term service. The performance of the rust layer during long-term service requires a longer test

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