CN104250740A - Preparation method of phosphatization liquid for steel pipe cold-rolling processing pre-treatment - Google Patents

Abstract

The invention discloses a preparation method of a phosphatization liquid for steel pipe cold-rolling processing pre-treatment. The phosphatization liquid comprises 22-26g/L of zinc oxide, 84-88g/L of phosphoric acid having a concentration of 85%, 16-20g/L of zinc dihydrogen phosphate, 22-26g/L of monocalcium phosphate, 6-8g/L of nickel sulfate, 4-6g/L of magnesium sulfate, 10-12g/L of tartrate, 4-6g/L of sodium citrate, 12-14ml/L of hydrogen peroxide and the balance water. The preparation method comprises the following steps of 1, mixing zinc oxide and water to obtain paste and carrying out stirring to obtain a uniform mixture, 2, slowly adding phosphoric acid into the zinc oxide paste with stirring until dissolution, 3, orderly adding zinc dihydrogen phosphate, monocalcium phosphate, nickel sulfate, magnesium sulfate, tartrate, sodium citrate and hydrogen peroxide into the solution obtained by the step 2 and carrying out stirring until dissolution, and 4, adding the rest of water into the solution obtained by the step 3 to adjust free acidity to 12-15 and total acidity to 70-90.

Description

A kind of compound method of Phosphating Solution of Steel Pipe Cold processing pre-treatment

Technical field

The present invention relates to technical field of surface, particularly relate to the compound method of the Phosphating Solution of a kind of Steel Pipe Cold processing pre-treatment.

Background technology

Steel pipe plug or open tube implement cold rolling processing, relates to the distortion in various degree of steel pipe surfaces externally and internally.In such processing operation, the surface stress of steel pipe and mould is all very high, and the rubbing characteristics between obvious surface in contact is very important, and good lubrication plays an important role in process of deformation.Technology before phosphating process occurs just is dipped in by steel part blank in hot soap lye or lubricant emulsion to process after pickling, then carries out cold rolling processing (being elongated by steel pipe under room temperature), make pipe cross section reduce 25 ~ 35%.Steel pipe can be made after cold rolling to harden, therefore before cold rolling further, need the process such as annealing, pickling, infiltration lubrication prescription.

Another kind of technique be exactly by pickling after workpiece to be processed place for some time, make it naturally get rusty, treat that workpiece surface forms loose oxide skin, then be dipped in the soap lye of heat or lubricant emulsion and process, then carry out cold rolling.The oxide skin that this technique is formed and matrix in conjunction with undertighten, easily come off in stretching change, to the wearing and tearing of workpiece and the consumption of cold working required drive all comparatively large, and each cold rolling before all have to pass through annealing, pickling, send out rust, the process such as infiltration lubrication prescription.

Prior art also has employing Phosphating Solution treatment technology, and Phosphating Solution used does not have monopoly, and there is many drawbacks.As understood heavy corrosion steel pipe using oxymuriate as the Phosphating Solution of accelerator, and for eliminating excessive chlorion in Phosphating Solution use procedure, need to add Silver Nitrate.The Phosphating Solution also had adopts nitrate/nitrite as accelerator, but nitrite is more suitable for normal temperature phosphating process, and cold rolling processing work is generally (50 ~ 80 DEG C) phosphatization between middle warm area, does not need nitrite.The another kind of situation of prior art is dissolved in by a certain percentage in water zinc nitrate, primary zinc phosphate, uses as Phosphating Solution.Because Phosphating Solution component is too simple, there is certain defect in the phosphorization film quality formed thus, directly the quality of the cold rolling converted products that impact is follow-up, and the modulation of phosphating solution acquires a certain degree of difficulty.

Summary of the invention

The object of the invention is to the compound method of the Phosphating Solution proposing a kind of Steel Pipe Cold processing pre-treatment, adopt the Phosphating Solution process steel pipe of the method preparation, do not need the process such as all annealed before each cold rolling processing, pickling, infiltration lubrication prescription, thus enormously simplify technique.In this Phosphating Solution, to form film heavy moderate for iron and steel work piece surface, quality meets the phosphatize phosphate coat of cold working requirement, and effectively can form lubricant film, is conducive to reducing the frictional force in cold working process, reduce the wearing and tearing of power consumption and instrument, thus production cost also decreases.

For reaching this object, the present invention by the following technical solutions:

A kind of compound method of Phosphating Solution of Steel Pipe Cold processing pre-treatment, consisting of of this Phosphating Solution: zinc oxide 22-26g/L, 85% phosphoric acid 84-88g/L, primary zinc phosphate 16-20g/L, monocalcium phosphate 22-26g/L, single nickel salt 6-8g/L, magnesium sulfate 4-6g/L, tartrate 10-12g/L, Trisodium Citrate 4-6g/L, hydrogen peroxide 12-14ml/L, surplus is water, and described compound method is carried out according to following steps:

1) by zinc oxide use water furnishing pasty state, and stir;

2) slowly added in the zinc oxide of pasty state by phosphoric acid, limit edged stirs, until dissolve;

3) then, add primary zinc phosphate, monocalcium phosphate, single nickel salt, magnesium sulfate, tartrate, Trisodium Citrate and hydrogen peroxide successively, be stirred to dissolving.

4) add the water of surplus, adjustment free acidity is at 12-15 point, and total acidity is at 70-90 point.

The present invention compared with prior art, has following beneficial effect:

1) feature of the Phosphating Solution of the inventive method preparation contains zine ion, magnesium ion, calcium ion etc. in phosphoric acid liquid as the positively charged ion forming phosphate crystal, makes the phosphatize phosphate coat of generation be more suitable for Steel Pipe Cold processing; In addition, in Phosphating Solution, suitably add sulfate ion, make the phosphatize phosphate coat film of generation heavy moderate, be beneficial in subsequent handling, realize continuous cold rolling processing;

2) the Phosphating Solution composition of the inventive method preparation is simple, not containing nitrate, and nitrite, not chloride acid group, therefore Phosphating Solution Environmental Safety, and easy to prepare, stability, favorable reproducibility, be easy to adjustment and control in parkerizing process;

3) Phosphating Solution of the inventive method preparation carries out phosphatization, the coating formed is equivalent to the effect of " lubricant ", can significantly reduce friction, and reduces the wearing and tearing of power consumption and instrument, more make the lubricant that applies thereafter more firmly sticky, not reason forming process and removing.

Embodiment

Embodiment one

A kind of compound method of Phosphating Solution of Steel Pipe Cold processing pre-treatment, consisting of of this Phosphating Solution: zinc oxide 22g/L, 85% phosphoric acid 88g/L, primary zinc phosphate 16g/L, monocalcium phosphate 26g/L, single nickel salt 6g/L, magnesium sulfate 6g/L, tartrate 10g/L, Trisodium Citrate 6g/L, hydrogen peroxide 12ml/L, surplus is water, and described compound method is carried out according to following steps:

1) by zinc oxide use water furnishing pasty state, and stir;

2) slowly added in the zinc oxide of pasty state by phosphoric acid, limit edged stirs, until dissolve;

3) then, add primary zinc phosphate, monocalcium phosphate, single nickel salt, magnesium sulfate, tartrate, Trisodium Citrate and hydrogen peroxide successively, be stirred to dissolving.

4) add the water of surplus, adjustment free acidity is at 12-15 point, and total acidity is at 70-90 point.

Embodiment two

A kind of compound method of Phosphating Solution of Steel Pipe Cold processing pre-treatment, consisting of of this Phosphating Solution: zinc oxide 26g/L, 85% phosphoric acid 84g/L, primary zinc phosphate 20g/L, monocalcium phosphate 22g/L, single nickel salt 8g/L, magnesium sulfate 4g/L, tartrate 12g/L, Trisodium Citrate 4g/L, hydrogen peroxide 14ml/L, surplus is water, and described compound method is carried out according to following steps:

1) by zinc oxide use water furnishing pasty state, and stir;

2) slowly added in the zinc oxide of pasty state by phosphoric acid, limit edged stirs, until dissolve;

3) then, add primary zinc phosphate, monocalcium phosphate, single nickel salt, magnesium sulfate, tartrate, Trisodium Citrate and hydrogen peroxide successively, be stirred to dissolving.

4) add the water of surplus, adjustment free acidity is at 12-15 point, and total acidity is at 70-90 point.

Embodiment three

A kind of compound method of Phosphating Solution of Steel Pipe Cold processing pre-treatment, consisting of of this Phosphating Solution: zinc oxide 24g/L, 85% phosphoric acid 86g/L, primary zinc phosphate 18g/L, monocalcium phosphate 24g/L, single nickel salt 7g/L, magnesium sulfate 5g/L, tartrate 11g/L, Trisodium Citrate 5g/L, hydrogen peroxide 13ml/L, surplus is water, and described compound method is carried out according to following steps:

1) by zinc oxide use water furnishing pasty state, and stir;

2) slowly added in the zinc oxide of pasty state by phosphoric acid, limit edged stirs, until dissolve;

3) then, add primary zinc phosphate, monocalcium phosphate, single nickel salt, magnesium sulfate, tartrate, Trisodium Citrate and hydrogen peroxide successively, be stirred to dissolving.

4) add the water of surplus, adjustment free acidity is at 12-15 point, and total acidity is at 70-90 point.

Claims (1)

1. a compound method for the Phosphating Solution of Steel Pipe Cold processing pre-treatment, is characterized in that, consisting of of this Phosphating Solution: zinc oxide 22-26g/L, 85% phosphoric acid 84-88g/L, primary zinc phosphate 16-20g/L, monocalcium phosphate 22-26g/L, single nickel salt 6-8g/L, magnesium sulfate 4-6g/L, tartrate 10-12g/L, Trisodium Citrate 4-6g/L, hydrogen peroxide 12-14ml/L, surplus is water, and described compound method is carried out according to following steps:

1) by zinc oxide use water furnishing pasty state, and stir;

2) slowly added in the zinc oxide of pasty state by phosphoric acid, limit edged stirs, until dissolve;

3) then, add primary zinc phosphate, monocalcium phosphate, single nickel salt, magnesium sulfate, tartrate, Trisodium Citrate and hydrogen peroxide successively, be stirred to dissolving.

4) add the water of surplus, adjustment free acidity is at 12-15 point, and total acidity is at 70-90 point.