An anticorrosion coating applied on a metal substrate layer in sea and a preparing method thereof

Abstract

The invention belongs to the field of sea corrosion and particularly relates to an anticorrosion coating applied on a metal substrate layer in sea. The coating is prepared from nanometer micro-capsules, a curing agent, a defoamer, a dispersant and a solvent, wherein the nanometer micro-capsules include capsule cores and a capsule material, the capsule cores are a corrosion inhibitor, the capsule material is silica or polymer resin, the particle size of the nanometer micro-capsules is 500-1200 nm, the thickness of the capsule material is 100-300 nm, and the mass percentage of the corrosion inhibitor in the micro-capsule is 15-30%. In the whole coating, the weight percentage of the curing agent is 80-90%, the weight percentage of the nanometer micro-capsules is 3-15%, the weight percentage of the corrosion inhibitor is 0.5-4.5%, the weight percentage of the defoamer is 1-10%, the weight percentage of the dispersant is 0.5-10% and the weight percentage of the solvent is 5-15%. The coating can perform rapid self-recognition and repairing for corrosion in the sea environment.

Description

technical field [0001] The invention belongs to the field of marine corrosion protection, and in particular relates to an anti-corrosion coating applied to a metal base in the ocean and a preparation method thereof. Background technique [0002] As we all know, the corrosion process shortens the service life of oilfield equipment and gathering pipelines, and becomes one of the important factors restricting the production of oil and gas industry. It is estimated that the loss caused by corrosion to my country's petroleum industry accounts for about 6% of the total output value of the industry. Among them, if appropriate anti-corrosion measures are taken, 30% to 40% of the loss can be recovered. In order to solve the corrosion problem in oil fields, many anti-corrosion technologies have been developed. Among them, the corrosion inhibitor technology has been widely used due to its simple application equipment, convenient use, low investment, large income, quick effect, abilit...

AI Technical Summary

Problems solved by technology

However, traditional corrosion inhibitors have their own defects: (1) Most corrosion inhibitors are toxic, which will cause great harm to the natural environment; (2) Some corrosion inhibitors are unstable; for example, the corrosion environment of oil fields is very special, Some corrosion inhibitors will deteriorate and lose their corrosion inhibition ability; (3) Not suitable for open operating systems

However, traditional organic polymer coatings are easily eroded or damaged by water vapor in seawater scouring and harsh fouling environments. Due to the extremely harsh corrosive environment in which marine structures are located, different from traditional coatings, the coatings need to be strengthened level design

[0004] The particle size of the microcapsules in the current anti-corrosion coating is relatively large, usually tens to hundreds of microns, and it is easy to be eroded or damaged in the harsh seawater environment. The mass of the corrosion inhibitor in the microcapsules accounts for a large proportion, although it can The released dose is large, but it is easy to reduce the survival amount of active ingredients and reduce the self-healing ability of the coating. Therefore, the appropriate proportion of corrosion inhibitors in the microcapsules is also particularly important

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