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Method for phosphating steel at normal temperature

A steel and normal temperature technology, applied in the direction of metal material coating process, etc., can solve the problems of high energy consumption, etc., and achieve the effect of uniform and dense film layer, good corrosion resistance, and simple process

Inactive Publication Date: 2019-02-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN102817023A discloses a high-temperature corrosion-resistant phosphating solution, which also has the same problem. The phosphating heating temperature is 80-95°C, and the energy consumption is too large

Method used

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  • Method for phosphating steel at normal temperature
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Examples

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Effect test

Embodiment 1

[0032] A method for phosphating iron and steel at room temperature, comprising the following steps:

[0033] (1) Use No. 240, No. 360, No. 600, and No. 1200 water abrasive paper to grind the steel test piece step by step to polish the steel surface, and then rinse it with running tap water for 1 min.

[0034] (2) Put the iron and steel test pieces in step (1) in 18% hydrochloric acid solution, pickle, rust, and scale at 60°C for 10 minutes, then rinse with flowing tap water for 1 minute, and then wash with deionized water for 1 minute .

[0035] (3) the iron and steel test piece of step (2) is put into phosphating solution and carries out phosphating treatment, and phosphating solution consists of: zinc oxide 15g / L, 85% phosphoric acid 41ml / L, 50% manganese nitrate solution 6g / L L, citric acid 1g / L, hydroxylamine sulfate 10g / L, and the balance is water.

[0036] Wherein, the preparation method of phosphating solution comprises the following steps:

[0037] a. Add one-third ...

Embodiment 2

[0045] A method for phosphating iron and steel at room temperature, comprising the following steps:

[0046] (1) Use No. 240, No. 360, No. 600, and No. 1200 water abrasive paper to grind the steel test piece step by step to polish the steel surface, and then rinse it with running tap water for 1 min.

[0047] (2) Put the iron and steel test pieces in step (1) in 18% hydrochloric acid solution, pickle, rust, and scale at 60°C for 10 minutes, then rinse with flowing tap water for 1 minute, and then wash with deionized water for 1 minute .

[0048] (3) the iron and steel test piece of step (2) is put into phosphating solution and carries out phosphating treatment, and phosphating solution consists of: zinc oxide 12g / L, 85% phosphoric acid 47ml / L, 50% manganese nitrate solution 4g / L L, citric acid 2g / L, hydroxylamine sulfate 12g / L, and the balance is water.

[0049] Wherein, the preparation method of phosphating solution comprises the following steps:

[0050] a. Add one-third of...

Embodiment 3

[0058] A method for phosphating iron and steel at room temperature, comprising the following steps:

[0059] (1) Use No. 240, No. 360, No. 600, and No. 1200 water abrasive paper to grind the steel test piece step by step to polish the steel surface, and then rinse it with running tap water for 1 min.

[0060] (2) Put the iron and steel test pieces in step (1) in 18% hydrochloric acid solution, pickle, rust, and scale at 60°C for 10 minutes, then rinse with flowing tap water for 1 minute, and then wash with deionized water for 1 minute .

[0061] (3) the iron and steel test piece of step (2) is put into phosphating solution and carry out phosphating treatment, and phosphating solution consists of: zinc oxide 15g / L, 85% phosphoric acid 51ml / L, 50% manganese nitrate solution 5g / L L, citric acid 3g / L, hydroxylamine sulfate 10g / L, and the balance is water.

[0062] Wherein, the preparation method of phosphating solution comprises the following steps:

[0063] a. Add one-third of...

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Abstract

The invention relates to the technical field of steel surface treatment, in particular to a method for phosphating steel at normal temperature. The method comprises the steps of carrying out surface grinding and acid pickling derusting on the steel to be treated, then completely soaking in a phosphating solution, and phosphating under the function of ultrasonic wave. The method for phosphating thesteel at normal temperature provided by the invention is simple in process, no unoiling, surface conditioning and passivation filling processes is needed, and the production efficiency is improved; meanwhile, no heating is needed during the phosphating process, and the steel can be phosphate at normal temperature, so that the energy is greatly saved; and in addition, the method is used for phosphating under the function of ultrasonic wave, and a formed phosphating film layer is low in surface porosity, is uniform and compact, has favorable corrosion resistance, and is suitable to be industrially popularized. The copper sulfate dropping experiment reaches to 322s, and rust spots cannot be generated on the steel after the steel is soaked in 3 percent of sodium chloride solution at normal temperature for more than 12 hours.

Description

technical field [0001] The invention relates to the technical field of iron and steel surface treatment, and the specific field is a phosphating treatment process. Background technique [0002] Phosphating is a commonly used metal pretreatment technology, which belongs to chemical conversion film treatment, and is mainly used in phosphating of steel, aluminum, zinc and other metal surfaces. Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. Steel is the most widely used structural material in modern times. In order to enhance the corrosion resistance of the steel substrate and prolong its service life, the surface of the steel material is usually treated to form a film on the surface that can protect the metal from water and other corrosive media, and further improve the substrate and coating in the subsequent coating process. layer bondin...

Claims

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Application Information

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IPC IPC(8): C23C22/18C23C22/73
CPCC23C22/182C23C22/73
Inventor 胡秀英胡贵芳李明红宋皖杰王琼
Owner JIANGSU UNIV OF TECH