Environment-friendly organometallic corrosion inhibitor and preparation method and application thereof

Abstract

The invention relates to an environment-friendly organometallic corrosion inhibitor and a preparation method and application thereof, and belongs to the technical field of corrosion inhibitors. The environmentally-friendly organometallic corrosion inhibitor is prepared by dissolving sodium gluconate, organic carboxylic acid additives, azole compounds, sodium molybdate, amino acid salt and pyrazineor piperazine compounds in purified water and adding sodium hydroxide to adjust a pH value to 11-12, and the electrochemical properties of the metal surface are changed synergistically by the adsorption of organic carboxylic acid salt and organic heterocyclic compounds on the metal surface and the passivation of molybdate, and a role of corrosion inhibition is achieved. An energy exchange mediumadded with the composite corrosion inhibitor has excellent corrosion inhibition performance for various metal materials existing in a system. Compared with an inorganic corrosion inhibitor, the consumption is slow, the medium is stable, and an environment-friendly mode is achieved. Used raw materials in the preparation method are cheap and the process is simple, the technical indicators tested meet the parameter requirements, the product formula is scientific and reasonable, the quality is stable and reliable, the corrosion inhibition performance is high, and the application range is wide.

Description

technical field [0001] The invention relates to a metal corrosion inhibitor and its preparation method and application, more specifically to an environment-friendly organic metal corrosion inhibitor and its preparation method and application, belonging to the technical field of corrosion inhibitors. Background technique [0002] The problem of metal corrosion pervades all industries of the national economy. Rust on the surface of metal materials and mechanical equipment will cause loss of performance and commodity value of metal products and mechanical equipment. It involves many issues such as resource consumption, secondary disasters, environmental pollution and harm to human health. According to statistics, corrosion loss accounts for about 4-5% of the gross national product, and the amount of steel scrapped due to corrosion is about 25%-30% of the current year's output. The annual economic loss caused by corrosion in the world is about 700 billion US dollars. Greater th...

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Problems solved by technology

[0005] At present, the composite corrosion inhibitors on the market are mainly based on the formula designed for the engine cooling system, mainly composed of inorganic salts. The organic carboxylate corrosion inhibitors lack mature formulas in China and mainly rely on imports. The price is high and it is difficult to promote. Neither inorganic nor organic corrosion inhibitors are specially formulated for aqueous energy exchange media

Most of the inorganic salt corrosion inhibitors are composed of nitrite, nitrate, sulfate, phosphate, borate, silicate and their stabilizers, and some even contain chromate, mainly by making the metal Surface passivation to form a passivation film to achieve the purpose of protecting metal materials. The following problems exist in the use of this type of corrosion inhibitor: (1) High toxicity, endangering human and biological health and safety, nitrite and nitrate removal In addition to being toxic, it is easily converted into carcinogenic ammonium nitrite. If there is chromate, the product is more toxic; (2) It is not friendly to the environment. Phosphate affects water or soil, which can easily cause oxidative enrichment of water and make algae, etc. Aquatic organisms grow and reproduce in large numbers, so that the rate of organic matter production far exceeds the rate of consumption, and the accumulation of organic matter in the water body destroys the aquatic ecological balance; (3) Sulfate and borate enter the water system and eventually penetrate into the soil, which is easy to cause soil quality. Acidification; (4) The silicate is unstable, even if a stabilizer is added, it is easy to form gel and deposit during use, block the system pipeline, make it difficult for the medium to circulate, and reduce the corrosion inhibition effect; (5) Consumption speed block , add a large amount or need to be added when using

[0006] Aiming at the shortcomings of the metal corrosion inhibitor products in the prior art, such as relatively short corrosion inhibition period, low adhesion, environmental pollution, and harm to human health, in order to improve the antirust function, durability and adhesion of the corrosion inhibitor, a metal corrosion inhibitor The etchant and its preparation method need to be developed urgently

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