Environment-friendly type phosphate concentrated liquor for removing rust and iron oxide scales and phosphating and application of environment-friendly type phosphate concentrated liquor

A technology for concentrating iron oxide scale and phosphoric acid, which is applied in the coating process of metal materials, etc., can solve problems such as long cleaning time of rust and oxide scale, insignificant coating performance and anti-rust effect, low content of phosphoric acid and effective substances, etc. Achieve the effect of convenient production, simple ingredients, and thorough rust removal

Active Publication Date: 2015-01-14
ANSHAN FALAN STEEL STRIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of phosphoric acid and effective substances used in the concentrated solution is not high, and the impact of the solution on the metal surface is small. When used as a coating primer, its coating performance and antirust effect are not very obvious. The cleaning time of rust and oxide scale is also long

Method used

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  • Environment-friendly type phosphate concentrated liquor for removing rust and iron oxide scales and phosphating and application of environment-friendly type phosphate concentrated liquor
  • Environment-friendly type phosphate concentrated liquor for removing rust and iron oxide scales and phosphating and application of environment-friendly type phosphate concentrated liquor
  • Environment-friendly type phosphate concentrated liquor for removing rust and iron oxide scales and phosphating and application of environment-friendly type phosphate concentrated liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 90 kg of phosphoric acid, add 3 kg of citric acid monohydrate and stir to dissolve, then add 2 kg of calcium phosphate and 4.9 kg of zinc phosphate, stir and dissolve until transparent, and finally add 0.1 kg of fluorine-containing alkyl quaternary ammonium salt cation Surfactant compounded with ethylene oxide adduct of fluorine-containing polypropylene glycol to prepare concentrate.

[0038] Dilute the concentrated solution 10 times with tap water to a concentration of 10%, soak a Φ13.5mm×60mm wire rod at 40°C for 20 minutes, and dry it in the air. Measure the surface appearance, thickness, adhesion and salt spray resistance of the phosphating film formed on the surface. The phosphating film on the surface is black, and there is no ash phenomenon; the measured thickness of the phosphating film can reach 24-25um; the adhesion is grade 1; the neutral salt spray resistance time is not less than 3 hours. See Table 2 for comparison indicators and reference standards ...

Embodiment 2

[0040] Zinc phosphate is 2.4kg, and other composition and content and preparation and use method thereof are with embodiment 1.

[0041] The phosphating film on the surface is black, and there is no ash phenomenon; the measured thickness of the phosphating film can reach 20-23um; the adhesion is grade 1; the neutral salt spray resistance time is not less than 3 hours.

Embodiment 3

[0043] Zinc phosphate is 0.8kg, and other composition and content and preparation and use method thereof are with embodiment 1.

[0044] The phosphating film on the surface is black, and there is no ash phenomenon; the measured thickness of the phosphating film can reach 15-17um; the adhesion is grade 2; the neutral salt spray resistance time is not less than 2.8 hours.

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Abstract

An environmentally friendly phosphoric acid concentrate used for dust removal, rust removal and phosphorization, characterized in that the raw materials are as follows by mass percentage: 70%-98% of phosphoric acid, 0.5%-5% of citric acid monohydrate, 0.008%-0.15% of a fluorine-based surfactant, 1%-10.3% of zinc phosphate, and 0.45%-4.5% of calcium phosphate. The concentrate can replace the hydrochloric acid and sulphuric acid used in traditional continuous acid-washing procedures for the surfaces of hot rolled plates, strips, wires, profiles and other metals. It can be applied to a pre-treatment for metal surface coatings, and can be used for rust removal on steel surfaces before electroplating non-ferrous metals, hot-dip galvanizing and hot-dip aluminium plating and in shot blasting and sand blasting processes for dust removal on steel surfaces. Compared with dust-removing and anti-dust products of the same type, the concentrate is convenient to produce, and has a high dilution ratio, good treatment effects, causes no pollution to the environment, and poses no potential safety hazard. The waste liquor produced can be used as a feed additive or a phosphate fertilizer after processing, and can also produce a high-quality by-product of iron phosphate.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal materials, in particular to an environment-friendly phosphoric acid concentrate used for rust removal, scale removal and phosphating instead of hydrochloric acid and sulfuric acid pickling and its application. Background technique [0002] Building materials, mechanical equipment, ships, automobiles and other industries are all involved in the treatment of derusting, descaling and passivation before steel processing. The traditional pre-treatment of steel uses treatment liquid for step-by-step treatment, using hydrochloric acid and sulfuric acid for rust removal, iron scale removal, and toxic chromium salt passivation. The environmental pollution caused by this process is difficult to control. [0003] Many patents that have been published at present advocate the integrated treatment agent of pickling and phosphating. Although there are many types, the content of effective com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07C23G1/02
CPCC23G1/088C23C22/17C23C22/22C23G1/06C23G1/02
Inventor 王恩栋王洪珂
Owner ANSHAN FALAN STEEL STRIP CO LTD
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