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Normal-temp iron series phosphorus liquid

A phosphating solution and iron-based technology, applied in the coating process of metal materials, etc., can solve the problems of difficult short-term protection, poor corrosion resistance of phosphating film, etc., to save heating time, breakthrough in corrosion resistance, and energy saving Effect

Inactive Publication Date: 2006-01-25
余取民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest problem of iron-based phosphating is that the corrosion resistance of the phosphating film is too poor. Although it can be improved by adding harmful Ni (nickel) and Cr (chromium), test the copper sulfate resistance of the phosphating film according to the provisions of Appendix D of GB 6807-86 Most of the solution dripping time is less than 30s, which cannot compete with the room temperature phosphating phosphating film, which can withstand the copper sulfate solution dripping time of more than 50s, such as zinc systems, and is difficult to be used for short-term protection between processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Phosphating solution formula: sodium dihydrogen phosphate (NaH 2 PO 4 ·2H 2 O): 9.2g·L -1 (In PO 4 3- Count); Ammonium dihydrogen phosphate [(NH 4 )H 2 PO 4 ]:14.0g·L -1 (In PO 4 3- Count); NO 3 - (Ammonium nitrate and nickel nitrate): 2.0g·L -1 (In NO 3 - Count); Ammonium heptamolybdate [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O]: 7.1g·L -1 (In MoO 4 2- Meter); TX-10 emulsifier: 1.0g·L -1 ; Ni 2+ (Nickel Nitrate): 1.1g·L -1 (Calculated as Ni); pH value: 5.0.

[0051] Phosphating situation and results: Brush the test piece with the working solution, after it is basically dry at 8-9℃ room temperature (no water mark is visible), then bake at 120℃ for 10min, after 30min, the corrosion resistance test time is 270s, 12h (Hour) after 305s; film weight 1.72g·m -2 ; Adhesion is up to level 1.

Embodiment 2

[0053] Phosphating solution formula: sodium dihydrogen phosphate: 23.3g·L -1 (In PO 4 3- Count); NO 3 - (Ammonium nitrate and nickel nitrate): 2.0g·L -1 ; Ammonium heptamolybdate: 7.1g·L -1 (In MoO 4 2- Total); TX-10 emulsifier: 10.0g·L -1 ; Ni 2+ (Nickel Nitrate): 1.30g·L -1 ; PH value: 5.0.

[0054] Phosphating situation and results: room temperature 15~18℃, use working fluid on the test piece (after the rust has been removed, keep the surface with 6.5g·M -2 Brush the oil) once, and then again after 5 minutes, rinse with tap water after it is basically dry, and let it dry by itself. After 12h, the corrosion resistance test is 85s, and the adhesion is up to level 1.

Embodiment 3

[0056] Phosphating solution formula: sodium dihydrogen phosphate: 2.3g·L -1 (In PO 4 3- Meter); ammonium dihydrogen phosphate: 12.1g·L -1 (In PO 4 3- Total); ammonium nitrate: 1.2g·L -1 (In NO 3 - Meter); sodium molybdate (NaMoO 4 ): 5.4g·L -1 (In MoO 4 2- Total); TX-10 emulsifier: 0.8g·L -1 ; PH: 4.0.

[0057] Phosphating situation and results: The test piece was immersed in the phosphating working solution at room temperature of 2℃, and then taken out and allowed to dry after 15 minutes. After 15 hours, the corrosion resistance time was 61s, and the adhesion reached level 1.

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Abstract

A high-speed energy-saving Fe-series phosphorizing liquid contains phosphate and phosphoric acid, nitrate, molybdate, Ca, Ni, tungstate, non-ion surfactant, citric acid and phytic acid. Its advantages are no heavy metal, high phosphorizing speed, multiple phosphorizing modes, and high uniformity, compactness and adhesion of phosphorized film.

Description

Technical field [0001] The invention belongs to the technical field of phosphating treatment before spraying on the surface of iron and steel, and relates to a normal temperature iron-based phosphating solution. Background technique [0002] Phosphating, which has a history of more than one hundred years, is a process in which metal workpieces are treated in solutions containing phosphates, oxidants, additives, etc., and a chemical reaction occurs on the surface to form a stable insoluble phosphate film. This phosphate film is called phosphating film, which has the functions of anti-corrosion, improving coating adhesion, wear resistance, friction reduction, and lubrication. Among them, phosphating used as a primer for short-term protection and improving coating adhesion accounts for 60-70% of phosphating applications. [0003] Phosphating, according to its treatment temperature, can be divided into high temperature phosphating, medium temperature phosphating (45-65℃), normal (low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/42
Inventor 余取民
Owner 余取民
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