Pickle liquor additive agent for special steel surface and method of preparing the same

Abstract

An additive and the preparing way for the addative of a surface pickler for a special steel is provided. The portions of raw materials and weight for the additive are: Diethylenetriamine 5-9 portions, chromized reducer 12-18 portions, detergent 20-24 portions, Nitrilotriacetic acid or HEDP 7-9 portions, potassium chlorate or sodium chlorate 7-12 portions, clean tap water 49-32 portions; the chromized reducer comprises Triethanolamine, formaldehyde and aqueous ammonia. The producing way for the additive is: first the tap water is put into a reaction vessel; then the potassium chlorate or sodium chlorate is added to react for about 10 min; the Nitrilotriacetic acid or HEDP is added to react evenly; the detergent and the Diethylenetriamine are added, and mixed evenly; then the chromized reducer is added and mixed to become a thick colorless liquid. The additive will be added in 1% of volume of aqua regia or mixed acid working liquid; when the temperature of the pickling work fluid rises to 60-80 centigrade, the rate for suppressing acid mist is more than 80%, the corrosion-retarding rate is more than 95%; the eight processes, namely prickling, degreasing, dephosphorizing, passivating and protection, etc. are completed in one operation. The additive can completely substitute highly toxic hydrofluoric acid and can passivate and protect jobs without passing through any acid, can greatly improve the surface roughness and corrosion resistance up to 3 times.

Description

technical field [0001] The invention relates to an additive for pickling liquid on the surface of special steel, which is added to aqua regia or mixed acid working liquid for surface treatment of nickel steel, titanium steel, chrome steel, stainless steel and high-low alloy steel, completely replacing highly toxic hydrofluoric acid. [0002] The invention also relates to a process for the production of this product. Background technique [0003] Special steel includes nickel steel, titanium steel, chrome steel, stainless steel, high and low alloy steel, etc. At present, the surface pickling of special steel generally adopts highly toxic hydrofluoric acid to wash off the scale, chemical degreasing, passivation with chromium, and manual repair and protection. Shanghai No. 2 Steel and No. 5 Steel did not dare to use hydrofluoric acid, so they used concentrated alkali high temperature blasting method at 1300°C to break scales, then pickled with mixed acid and phosphonic acid, d...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a special steel surface pickling solution additive, which can be added to the aqua regia pickling working solution and mixed acid pickling working solution to solve the surface acidity of nickel steel, titanium steel, chromium steel, stainless steel, and high-low alloy steel in one process. Problems of degreasing, descaling and passivation protection