Lithium bromide absorption refrigerator high-efficiency corrosion inhibitor and preparation method thereof

Abstract

The invention provides a lithium bromide absorption refrigerator high-efficiency corrosion inhibitor and a preparation method thereof and in particular relates to a polyoxometalate composite inorganic high polymer material. The lithium bromide absorption refrigerator high-efficiency corrosion inhibitor provided by the invention is prepared from the following raw materials in parts by weight: 15-35 parts of lithium molybdate, 10-50 parts of lithium tungstate, 1-5 parts of lithium dihydrogen phosphate, 50-75 parts of deionized water, 4-15 parts of hydrobromic acid and 0.5-2 parts of zinc dihydrogen phosphate. The preparation method comprises the following steps of: firstly preparing hydrobromic acid solution, dissolving lithium molybdate, lithium tungstate and lithium dihydrogen phosphate, heating lithium tungstate solution and lithium dihydrogen phosphate solution in a reaction kettle, regulating the pH value, then dropwise adding lithium molybdate solution, and finally regulating the pH value and adding zinc dihydrogen phosphate, so that the lithium bromide absorption refrigerator high-efficiency corrosion inhibitor is obtained. Compared with the prior art, the lithium bromide absorption refrigerator high-efficiency corrosion inhibitor provided by the invention has the characteristics that inner cavity material of the lithium bromide refrigerator is obviously passivated, a passivated film is excellently bonded with the inner cavity material and has high corrosion resistance, and the corrosion inhibitor has good temperature resistance and stability and is low in additive amount.

Description

technical field [0001] The invention provides a high-efficiency corrosion inhibitor for a lithium bromide absorption refrigerator, in particular to a heteropoly-salt composite inorganic polymer material. Background technique [0002] At present, there are mainly two kinds of lithium bromide absorption refrigerator corrosion inhibitors on the market. Although both have good corrosion inhibition performance, the adhesion between the oxide film and the base layer is not very ideal, and defects such as peeling and shelling are prone to occur, which often leads to lithium bromide solution. It is easy to deteriorate and affect the service life of the lithium bromide solution; in addition, chromate will cause serious pollution and strong carcinogenicity to the environment; lithium molybdate is easy to generate hydrogen during the entire operation of the lithium bromide absorption refrigerator, which affects the vacuum degree of the system, thereby affecting The absorption effect of...

AI Technical Summary

Problems solved by technology

It has improved the existing chromate corrosion inhibitors that cause serious pollution and strong carcinogenicity to the environment, and the shortcomings that the single lithium molybdate corrosion inhibitor is easy to generate hydrogen for the inner cavity material of the lithium bromide refrigerator