Rusty scale growth inhibitor for rusted steel and preparation method thereof

The invention discloses a rusty scale growth inhibitor for rusted steel. The rusty scale growth inhibitor is prepared from the following raw materials in parts by weight: 50-100 parts of inorganic acid, 50-100 parts of gallic acid, 10-100 parts of aluminum triphosphate, 10-50 parts of potassium hydrogen tartrate, 30-50 parts of thiourea, 100-300 parts of isoamylol, 10-50 parts of surfactant, 1-50 parts of defoamer, 1-30 parts of thickener and 500-800 parts of water. The inhibitor can infiltrate into the deep part of the rusty scale, acts with active gamma-FeOH, and inhibits transformation to Fe3O4, so as to inhibit growth of an iron scale. In addition, chelate transformation reaction also can be carried out on the existing iron scale, and the iron scale is transformed into an inert protection layer. The inhibitor is broad in demands on the thickness of the rusty scale, does not cause corrosion to a steel base material, and can replace artificial derusting treatment, and the rusted steel base material reacting