High-efficiency preparation method of novel phosphating solution
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A phosphating solution and a new type of technology, applied in the field of phosphating solution, can solve the problems of excessive sediment, thick phosphating film, unstable bath liquid, etc.
Inactive Publication Date: 2014-02-12
TIANJIN JIANFA PRECISION MACHINERY MFG
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Problems solved by technology
At present, the commonly used phosphating technology is zinc-based medium-temperature phosphating. The phosphating temperature is high, acid mist is easily generated, the bath solution is unstable, and there are more sediments, the phosphating film is thick, and the adhesion of the coating film after coating is low. The corrosion resistance is also poor, and the nitrite and heavy metal ions used pollute the environment
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Embodiment 1
[0008] The recipe is: 21.0g / L phosphoric acid, 5g / L zinc oxide, 6g / L calcium nitrate, 0.5g / L barium nitrate, 3g / L hydroxylamine sulfate and 3.0g / L nitric acid. Specific operation: Weigh 5g of zinc oxide, mix it into a paste with a small amount of water, slowly add it to 21.0g of diluted phosphoric acid, and after the dissolution is complete, slowly add 6g / L calcium nitrate, 0.5g / L calcium nitrate and 0.5g / L L barium nitrate, 3g / L hydroxylamine sulfate, 3.0g / L nitric acid and a certain amount of water, fully stir and dissolve, finally add water to 1L to get concentrated phosphating solution, dilute the concentrated solution to 20 times to get working solution.
Embodiment 2
[0009] Embodiment 2: formula is: 21.0g / L phosphoric acid, 6g / L zinc oxide, 6g / L calcium nitrate, 0.5g / L barium nitrate, 3g / L hydroxylamine sulfate and 3.0g / L nitric acid. Specific operation: Weigh 6g of zinc oxide, make it into a paste with a small amount of water, slowly add it to 21.0g of diluted phosphoric acid, after the dissolution is complete, slowly add 6g / L calcium nitrate, 0.5g / L calcium nitrate and 0.5g / L L barium nitrate, 3g / L hydroxylamine sulfate, 3.0g / L nitric acid and a certain amount of water, fully stir and dissolve, finally add water to 1L to get concentrated phosphating solution, dilute the concentrated solution to 20 times to get working solution.
Embodiment 3
[0010] Embodiment 3: formula is: 21.0g / L phosphoric acid, 7g / L zinc oxide, 7g / L calcium nitrate, 0.5g / L barium nitrate, 3g / L hydroxylamine sulfate and 4.0g / L nitric acid. Specific operation: Weigh 7g of zinc oxide, make a paste with a small amount of water, slowly add it to 21.0g of diluted phosphoric acid, and after the dissolution is complete, slowly add 7g / L calcium nitrate, 0.5g / L calcium nitrate and 0.5g / L L barium nitrate, 3g / L hydroxylamine sulfate, 4.0g / L nitric acid and a certain amount of water, fully stirred and dissolved, and finally add water to 1L to obtain concentrated phosphating solution, dilute the concentrated solution to 20 times to obtain working solution.
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Abstract
The invention discloses normal-temperature phosphating solution free from nitrite and heavy metal; the film forming speed of the phosphating solution is rapid; phosphating film grains are rapidly refined; and the corrosion resisting property of the phosphating solution is greatly increased. The technical scheme provided by the invention is as follows: the phosphating solution is composed of six main components including phosphoric acid, zinc oxide, calcium nitrate, barium nitrate, hydroxylamine sulphate and nitric acid. The novel phosphating solution disclosed by the invention has the advantages that: the phosphating solution is free from nitrite and heavy metal; about 2 g of French grey, uniform and compact phosphating films per square metre can be generated by immersing at 5-40 DEG C and phosphating for 5-10 min; the dropping time of CuSO4-resistant solution is up to 90-140 s; the immersion time of 3% sodium chloride resistant solution is 240 min; first-stage clean phosphating production is realized; furthermore, the service life of the phosphating solution is longer; little sediment is generated; the generated phosphating film has good quality; and the novel phosphating solution disclosed by the invention can be used for coating the surface of steel.
Description
technical field [0001] The invention relates to a phosphating solution used for surface treatment of steel and its products, in particular to a preparation method of a high-efficiency novel phosphating solution. Background technique [0002] Phosphating treatment of metal is a traditional surface treatment technology. It is a process in which steel is treated in a phosphating solution composed of dihydrogen phosphate, oxidant, additives, etc., and a phosphating film with a thickness of several microns is formed on the surface. , including zinc-calcium-based, manganese-based and iron-based types. Phosphating can significantly improve the adhesion and protection ability of the coating. It is a key technology to ensure the quality of coating and a necessary process for the production of automobiles, home appliances and machinery. At present, the commonly used phosphating technology is zinc-based medium-temperature phosphating. The phosphating temperature is high, acid mist is ...
Claims
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