Solution and method for evaluating corrosion resistance of water-based antirust layer on surface of steel plate

Abstract

The invention discloses a solution for evaluating the corrosion resistance of the water-based antirust layer on the surface of a steel plate. The solution comprises 1.1-2.5 mu g/L of sulfuric acid, 3.8-7.2 mu g/L of hydrochloric acid, 1.02-1.79 g/L of disodium hydrogen phosphate, 13.95-16.26 g/L of sodium dihydrogen phosphate, 1.51-3.85 mg/L of sodium bicarbonate. In addition, the invention further discloses a method for evaluating the corrosion resistance of the water-based rust-proof layer on the surface of the steel plate. By adopting the solution, the characteristics of the industrial atmospheric environment can be embodied when the solution is tested, the severity degree is moderate, the resolution is good, the corrosion resistance of the water-based antirust agent to be measured canbe measured in a proper test period, and though the test condition is too harsh, the difference of the corrosion resistance of the surface of the sample treated by different water-based rust-proof agents can be distinguished.

Description

technical field [0001] The invention relates to a solution and a method thereof, in particular to a solution and a method for evaluating the corrosion resistance of a steel plate surface. Background technique [0002] During the production process, storage and transportation of cold-rolled steel plates, or according to the needs of downstream users, the surface of the steel plate is treated with a water-based anti-rust agent to form a layer of anti-rust film on the surface to prevent the steel plate material from rusting during storage and transportation. Therefore, it is very necessary to be able to objectively evaluate the surface corrosion resistance of cold-rolled steel sheets treated with water-based antirust agents, which is crucial for the selection and application of water-based antirust agents in the production process of cold-rolled steel sheets. [0003] At present, the damp heat test evaluation methods stipulated in standards such as GB / T2361 "Damp Heat Test Meth...

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Problems solved by technology

However, this rust resistance test method also has deficiencies: First, the dryer used in the test needs to be sealed, which is completely different from the industrial atmospheric environment in the actual storage and transportation of steel plates, and cannot reflect the natural conditions in actual use. The mechanism is also different from the actual one; the second is that the anti-rust test method reflects the anti-rust effect under the condition of constant temperature and humidity, while the steel plate experiences the natural conditions of alternating temperature and humidity during the actual storage and transportation process, including Therefore, the anti-rust test method cannot fully reflect the protective effect of the anti-rust layer on the steel plate during the actual storage and transportation process.

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