Novel corrosion inhibitor for inhibiting corrosion of steel in tap water or seawater and use method thereof

Abstract

The invention discloses a novel FX corrosion inhibitor for inhibiting the corrosion of steel in tap water or seawater, which consists of 20%-40% of phosphoric acid triethanolamine, 20%-40% of zinc dihydric phosphate, 20%-40% of sodium tripolyphosphate and 10%-30% of hexamethylene tetramine. When the using concentration of the corrosion inhibitor is 75ppm-250ppm, multiple protective films not onlycan be formed on the surface of the steel in the tap water or seawater, but also has self-repairing capability when being damaged, so that the corrosion inhibitor is especially effective in inhibitingthe corrosion of the steel in the tap water or seawater, and the corrosion inhibiting rate is close to 100%. The corrosion inhibitor has small required dosage, cheap and easily-obtained raw materials, low cost, no toxicity, no pollution, good anti-scaling function, reduced blowdown, and good matching with oxidative bactericides, thus being an efficient water quality treating agent.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a formulation of a novel corrosion inhibitor (abbreviated as FX novel corrosion inhibitor) for inhibiting steel corrosion in tap water or seawater and a method of use thereof. Background technique [0002] The chemical corrosion inhibitor method to inhibit the corrosion of steel in tap water or seawater is not only effective, but also relatively simple. For example, the product name PC-602 water quality stabilizer is essentially a phosphorus-based corrosion inhibitor with scale inhibition function ["Chinese Journal of Corrosion and Anticorrosion", 1988, 8(1): 61]. It is composed of polyol phosphate, polyol polyphosphate, polyphosphate and orthophosphate, when the concentration is 300ppm, the 3 The corrosion inhibition rate of steel is as high as 98% (weight loss method). As another example, the research report of Li Haiming and others pointed out that when the concentration of the comp...

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Problems solved by technology

The former is used in tap water medium, and the latter is used in seawater medium. Their common problem is that the range of application is limited; the former requires a large dose and high cost; the latter has a low inhibitory concentration of corrosion inhibitor, but sodium molybdate is expensive , the cost is high, and the corrosion inhibition rate is low, which needs to be greatly improved