Environment-friendly metal rust removing solution

Abstract

The invention discloses an environment-friendly metal rust removing solution which comprises components in parts by weight as follows: 80 parts of water, 40-60 parts of straw ash, 20-30 parts of citric acid and 2-5 parts of acetic acid. According to the environment-friendly metal rust removing solution, the straw ash adopting a porous structure is applied to the rust removing solution, and under the combined action of the citric acid and the acetic acid, the rust removing solution has a good rust removing function for metal, especially has the excellent rust removing effect on steel type metal, causes low damage to mechanical properties of the metal and is safe and environment-friendly during operation.

Description

technical field [0001] The invention relates to a metal derusting liquid. Specifically relates to an environment-friendly metal descaling liquid. Background technique [0002] Metals (such as: steel) are prone to rust when placed outdoors or in the open air, which not only affects the appearance quality, but also affects the normal progress of painting, bonding and other processes. economic loss. [0003] Traditional chemical rust removal usually uses strong acid, which can chemically react with rust and metal oxides to generate soluble salts, so as to achieve the purpose of rust removal. At the same time of rust removal, acid can react with base metal to release hydrogen, hydrogen It can exert pressure on rust and insoluble scale, which is beneficial to their peeling and reduction of high-valent iron, and accelerates the pickling process. [0004] However, the traditional acid solution treatment method also has obvious defects: that is, the generation of a large amount o...

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Problems solved by technology

[0004] However, the traditional acid solution treatment method also has obvious defects: that is, the generation of a large amount of hydrogen during the treatment process will cause hydrogen embrittlement of the steel, which will cause the mechanical properties of the metal to decline and affect the strength of the steel itself; at the same time, it is easy to form acid mist, affecting The health of the operator and the surrounding equipment and environment are corroded; the consumption of acid is also large, which increases the cost of treatment; this type of acid will cause over-corrosion of steel

In addition, the residues produced in large quantities need to be discharged frequently, which not only seriously corrodes industrial pipelines, but also pollutes the soil and the environment.