Corrosion inhibition additive for multicomponent water-series fire extinguishing agent

Abstract

The invention discloses a corrosion inhibition additive for a multicomponent water-series fire extinguishing agent. The multicomponent water-series fire extinguishing agent comprises the following components of sodium molybdate with the concentration of 0.5-1.0 g / L, sodium tripolyphosphate with the concentration of 0.3-0.5 g / L, thiourea with the concentration of 0.6-0.8 g / L, citric acid with the concentration of 0.2-0.4 g / L, ammonium tungstate with the concentration of 0.1-0.4 g / L, sodium gluconate with the concentration of 0.1-0.4 g / L and benzotriazole with the concentration of 0.4-0.8 g / L. A fire extinguishing agent system relates to a mixed solution which comprises all the components of the original water-series fire extinguishing agent and all components of the corrosion inhibition additive. The preparation method of the fire extinguishing agent system comprises the steps that all the components of the original water-series fire extinguishing agent are prepared into a concentrated solution with the volume of about 75% of the total volume; all the components of the corrosion inhibition additive are prepared into a concentrated solution with the volume of about 15% of the total volume; then the two solutions are mixed; and then water is added until the constant volume reaches the total volume. By adopting the corrosion inhibition additive, the corrosivity of the original fire extinguishing agent to metal copper can be lowered by about 10 times; and the corrosion rate for the metal copper is obviously lowered, so that the multicomponent water-series fire extinguishing agent is applicable to current copper firefighting fire extinguishing equipment.

Description

technical field [0001] The invention relates to a corrosion-inhibiting additive, in particular to an additive added to a multi-component water system fire extinguishing agent for reducing its corrosion to metal equipment. Background technique [0002] At present, the danger of fire is becoming more and more prominent, and the demand for fire extinguishing agents with high efficiency, environmental protection and low price is becoming more and more urgent. As a non-flammable liquid, water is the most primitive and most commonly used fire extinguishing agent, and it is also the most abundant, most convenient and cheapest fire extinguishing agent, and is widely used to extinguish fires in buildings, forests, grasslands and underground mines. Add some additives to improve fire extinguishing performance in water, and the formed system is called water-based fire extinguishing agent. Water-based fire extinguishing agents with high fire extinguishing performance usually contain mul...

AI Technical Summary

Problems solved by technology

[0003] At present, ammonium chloride, ammonium carbonate, ammonium bicarbonate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate salts, etc. are usually used as water-based fire extinguishing agents with high fire extinguishing efficiency. After these substances are dissolved in water, the chloride ions, ammonium ions, Anions and cations such as phosphate ions and carbonate ions are highly corrosive to metal materials; however, the current standard fire extinguishing equipment usually uses metal materials such as copper, aluminum, and steel. Corrosion reactions will cause damage to metal pipes or blockage of nozzles, making fire extinguishing vehicles or spraying devices scrapped; similarly, multi-component water-based fire extinguishing agents generally cannot use metal materials as container packaging materials

For example, the fire extinguishing agent provided by the patent ZL 201110202121.0 compound synergistic type A and B water-based fire extinguishing agent has high fire extinguishing efficiency, but because it contains more salt components, it is not suitable for fire-fighting equipment. Commonly used metal materials, especially metal Copper is extremely corrosive and cannot be used in active-duty fire-fighting equipment that uses copper as the outer packaging or pipes and nozzles, which greatly limits its application fields

[0004] The high corrosivity of multi-component water-based fire extinguishing agents to metal fire-fighting equipment has become an urgent bottleneck in the field of fire protection. According to the principle of metal corrosion and protection, there are two methods to solve the corrosion problem: the first The method is to coat a layer of protective layer with anti-corrosion performance on the inside of the fire extinguishing fluid container, pipe, and nozzle, but this method has great limitations, is difficult to operate, and is very expensive, so it has little practical value

The second method is to add corrosion inhibitor additives to the fire extinguishing fluid. Selecting a suitable targeted corrosion inhibitor can reduce the corrosiveness of the fire extinguishing fluid to specific material containers, pipes, and nozzles. This is a relatively easy method to operate. However, The water-based fire extinguishing agent made of various inorganic salts and water-soluble organic compounds has high fire extinguishing efficiency, but because it contains high concentrations of anions and cations such as chloride ions, ammonium ions, phosphate ions, and carbonate ions, Therefore, it is often highly corrosive to copper, aluminum, steel and other metal materials, especially metal copper; therefore, it cannot be used in active-duty fire-fighting equipment that uses copper as the outer packaging or pipes and nozzles, which greatly limits its application field

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