Preparation method of humidity regulating and release controlling type gas phase inhibitor

Abstract

The invention discloses a preparation method of a humidity regulating and release controlling type gas phase inhibitor. The preparation method comprises the following steps that step 1, a pure gas phase inhibitor is added to deionized water, and heating for dissolution is conducted; step 2, the temperature keeps unchanged, and a cosolvent with the volume of 0.2-2 times of the volume of the deionized water is added, so that the pure gas phase inhibitor is completely dissolved; step 3, a porous hygroscopic material is heated to the same temperature; step 4, under stirring, the dissolved gas phase inhibitor solution is added to a porous carrier which is heated to the same temperature, and even stirring is conducted; and step 5, drying of low temperature and vacuum is conducted on the mixtureevenly stirred, and all the cosolvent is removed to obtain the humidity regulating and release controlling type gas phase inhibitor. According to the preparation method, the gas phase inhibitor prepared has the function of adjusting the environmental humidity, and the volatilization speed of VCI can be controlled.

Description

technical field [0001] The invention relates to the technical field of metal corrosion and protection, in particular to a gas phase corrosion inhibitor. Background technique [0002] The phenomenon of metal corrosion is extremely common. The metal loss due to metal corrosion in the world is more than 100 million tons per year. Among them, atmospheric corrosion is the most widespread form of corrosion, and the loss caused by it accounts for more than half of the total metal corrosion loss. Since the total amount of mineable metals in the ground is limited, it is very important to effectively reduce metal corrosion to reduce economic losses and alleviate resource crises. [0003] In order to reduce the corrosion loss of metals, many metal corrosion protection technologies have been developed, such as electroplating, coating, plastic spraying, and corrosion inhibition. received continuous attention. [0004] Vapor phase corrosion inhibition technology is a technology that use...

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Problems solved by technology

[0009] (4) Low cost and long anti-rust period. The cost of gas-phase anti-rust storage is 20% to 50% of anti-rust grease storage, and 7% to 17% of oil-coated anti-rust storage, but the storage protection period is as long as 5 years above

However, after a large number of practical application results, it seems that this is not entirely the case

When the ambient humidity is too high, the corrosion tendency of the metal increases, and the corrosion inhibition effect of VCI will become worse. However, when the ambient humidity is too low, the corrosion tendency of the metal weakens, but the corrosion inhibition effect of VCI also weakens, especially When the ambient humidity is too low when using VCI for the first time, the metal corrosion inhibition effect will be significantly weakened

This is mainly because VCI forms a protective film on the metal surface on the premise that there is a water film on the metal surface. VCI dissolves in the water film on the metal surface and dissociates a characteristic ion group, which is adsorbed on the metal surface to form a protective film. When the humidity in the environment is too low, it is difficult to form a complete water film on the metal surface, so it is also difficult to form a complete protective film, so the corrosion inhibition effect of VCI on the metal is weakened.

[0012] Because the gas phase corrosion inhibition technology developed at present does not consider the influence of the humidity in the environment on the corrosion inhibition effect, so the environmental humidity is not regulated, so that when the environmental humidity is too high or too low, it cannot achieve sufficient mitigation. corrosion protection

On the other hand, the existing gas-phase corrosion inhibition technology all utilizes the natural volatilization process of VCI, and does not control its volatilization rate. This results in that when the temperature is low, the amount of VCI volatilization is not enough to inhibit corrosion. The effect is affected, and when the temperature is high, the volatilization amount of VCI is too much, exceeding the amount required for metal corrosion inhibition, resulting in unnecessary loss of VCI and reducing the protection period of VCI

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