Weathering resistant steel surface stabilization rust layer rapid generation treatment agent and use method thereof

Abstract

The invention discloses a weathering resistant steel surface stabilization rust layer rapid generation treatment agent and a use method thereof. The treatment agent is composed of an agent A and an agent B; the agent A is composed of, by mass percent, 0.4 to 2% of CuSO4, 0.1 to 2.5% of NaCl, 0.5 to 3% of FeCl3, 0.1 to 0.5% of HCl and the balance water; the agent B is a wetting agent water solution, and the mass percent of the wetting agent ranges from 0.2 to 3.5%, and the balance is water. The wetting agent is one or few of NaH2PO4, Na5P3O10, (NaPO3)6, C6H5Na3O7.2H2O. The agent has the beneficial effects that the treatment agent can directly treat the weathering resistant steel with scales on the surface, the step of removing the scale is omitted, the treatment speed and the practicabilityof the treatment agent are improved, in addition, the treatment agent is a water-based system and does not contain components like hexavalent chromium, the environment friendliness is achieved, t hetreatment agent is simple in formula and treatment process, the preparing and construction cost is low, and the agent is suitable for being applied to the metallurgy industry and the construction site.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, and relates to a surface rust layer stabilization treatment agent for weathering steel and a use method thereof. Background technique [0002] Weathering steel has good atmospheric corrosion resistance, and a dense and stable rust layer can be formed on the surface during use. This rust layer has good corrosion resistance and can effectively prevent the entry of corrosive media. The exposed use of weathering steel eliminates the need for painting and regular anti-corrosion treatment, so it can produce good economic and environmental benefits. However, weathering steel also has some problems when it is used bare. First of all, it takes 4 to 10 years to form a stabilized rust layer on the surface of weathering steel. Before that, exposed weathering steel, like ordinary carbon steel, produces loose rust layers and rust liquids such as red rust and yellow rust, and the rust liquid hangs...

AI Technical Summary

Problems solved by technology

CN102191492A discloses a rust conversion agent, the conversion agent is composed of a pre-treatment liquid and a post-treatment liquid, the pre-treatment liquid contains iron powder, urotropine, glycerin and water, etc., and the post-treatment liquid contains polyphosphoric acid, manganese carbonate, Acetic acid, tannic acid, and water; although this conversion agent can effectively inhibit corrosion by inhibiting the anodic reaction process of steel, it takes a long time to treat. Steel parts need to be coated with pre-treatment liquid for 1 hour before spraying post-treatment liquid. It needs to be left for 24 hours to get a complete treatment film, so it is not suitable for implementation in metallurgical enterprises and construction sites of steel components

Shot blasting or pickling is often used for the surface descaling treatment of steel substrates. This step is time-consuming and requires additional processing costs, which affects the practicability of weathering steel treatment agents and also produces a certain degree of environmental pollution.

[0004] To sum up, the existing technologies for stabilizing the rust layer on the surface of weathering steel have disadvantages such as long treatment time, many treatment steps, unsuitable treatment methods for on-site application, and need to remove the surface oxide scale before treatment.

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