A kind of manganese series phosphating solution and its application

A manganese-based phosphating solution and solvent technology, applied in the direction of metal material coating process, etc., can solve the problems of long phosphating film formation time, slow phosphating reaction speed, uneven phosphating film roughness, and achieve film forming speed. Fast, reduced polarization potential, cost-saving effect

Active Publication Date: 2020-05-26
HUNAN JINHUA SCI & TECH GRP
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Problems solved by technology

With the development of the times, low-chromium alloy steel for oil pipe hoops can no longer meet the needs of practical applications. Therefore, high-chromium alloy steel oil pipe hoops made of P110, V150, and V175 have appeared. For these oil pipe hoops, if still Using the existing high-temperature manganese-based phosphating solution for surface chemical treatment, there will be many problems: First, the phosphating reaction speed is slow, and the phosphating film takes a long time: P110 needs 60-70 minutes to complete the reaction; V150 , V175 needs more than 90 minutes to complete the reaction; second, after phosphating treatment on high-chromium alloy steel, the thickness of the phosphating film obtained is much thinner than that of low-chromium alloy steel. After phosphating treatment with phosphating solution, the obtained phosphating film is generally 7-14 μm (generally, the thickness of phosphating film is required to be 15-30 μm); third, during the phosphating process, iron is dissolved by acid and dissolved Part of the iron ions participate in the film-forming reaction to form the phosphating film components, while the other part of the iron ions are oxidized into precipitates and precipitated from the solution to form phosphating slag. The existing high-temperature manganese-based phosphating solution is prone to produce a large amount of phosphating slag , the phosphating slag will adhere to the phosphating workpiece, making the phosphating film rough and uneven
[0004] From this point of view, although ordinary manganese-based phosphating solutions can be barely suitable for surface phosphating of low-chromium alloy steel, once the content of chromium alloy in the steel workpiece becomes high, the alloying elements such as chromium, manganese, and nickel in the chromium alloy will Increase the polarization potential of the steel surface, and at the same time, chromium-nickel is easy to form a protective oxide film on the surface of the pipe ferrule. In this way, it is difficult for ordinary manganese phosphating solution to corrode the steel surface. The film obtained by phosphating treatment The layer is thin, and it is easy to produce a large amount of phosphating slag

Method used

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  • A kind of manganese series phosphating solution and its application
  • A kind of manganese series phosphating solution and its application
  • A kind of manganese series phosphating solution and its application

Examples

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Embodiment 1

[0031] Mix Marzoff salt, sulfuric acid, ammonium molybdate, sodium fluorosilicate, copper sulfate pentahydrate, and 1,10-phenanthroline to obtain a phosphating concentrate, and then follow the phosphating concentrate: water = 1:4 ( weight ratio) to obtain a manganese-based phosphating solution.

[0032] Among them, the content of each component in the manganese-based phosphating solution is as follows: Maziv salt 195 g / L, sulfuric acid 60 g / L, ammonium molybdate 4 g / L, sodium fluorosilicate 3.5 g / L, pentahydrate Copper sulfate 0.6g / L, 1,10-phenanthroline 1.1 g / L.

[0033] Among them, the total acidity of the phosphating solution is TA 80-130; the free acidity is FA10-22.

[0034] Use this manganese-based phosphating solution to phosphate the surface of V150 high-chromium alloy steel pipe ferrules. The entire operation process of the phosphating process is as follows: degreasing→water washing→activation (pickling)→surface adjustment→phosphating→water washing→passivation Phosp...

Embodiment 2

[0036] Mix Marzoff salt, sulfuric acid, ammonium molybdate, sodium fluorosilicate, copper sulfate pentahydrate, and 1,10-phenanthroline to obtain a phosphating concentrate, and then follow the phosphating concentrate: water = 1:4 ( weight ratio) to obtain a manganese-based phosphating solution.

[0037] Among them, the content of each component in the manganese-based phosphating solution is as follows: 375 g / L of Maziv salt, 70 g / L of sulfuric acid, 6 g / L of ammonium molybdate, 5.5 g / L of sodium fluorosilicate, copper sulfate pentahydrate 1g / L, 1,10-phenanthroline 1.3 g / L.

[0038] Among them, the total acidity of the phosphating solution is TA 80-130; the free acidity is FA10-22.

[0039] Use this manganese-based phosphating solution to phosphate the surface of V150 high-chromium alloy steel pipe ferrules. The entire operation process of the phosphating process is as follows: degreasing→water washing→activation (pickling)→surface adjustment→phosphating→water washing→passivat...

Embodiment 3

[0041] Mix Marzoff salt, sulfuric acid, ammonium molybdate, sodium fluorosilicate, copper sulfate pentahydrate, and 1,10-phenanthroline to obtain a phosphating concentrate, and then follow the phosphating concentrate: water = 1:4 ( weight ratio) to obtain a manganese-based phosphating solution.

[0042] Among them, the content of each component in the manganese-based phosphating solution is as follows: 285 g / L of Maziv salt, 65 g / L of sulfuric acid, 5 g / L of ammonium molybdate, 4.5 g / L of sodium fluorosilicate, 0.8 g / L of copper sulfate pentahydrate g / L, 1,10-phenanthroline 1.2g / L.

[0043] Among them, the total acidity of the phosphating solution is TA 80-130; the free acidity is FA10-22.

[0044] Use this manganese-based phosphating solution to phosphate the surface of V150 high-chromium alloy steel pipe ferrules. The entire operation process of the phosphating process is as follows: degreasing→water washing→activation (pickling)→surface adjustment→phosphating→water washing...

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Abstract

Provided is a manganese series phosphating solution. Water is used as a solvent. The manganese series phosphating solution comprises, by weight, 195-375 parts of manganese dihydrogen phosphate, 60-70parts of sulfuric acid, 4-6 parts of molybdate, 3.5-5.5 parts of fluorosilicate, 0.6-1 part of copper sulfate pentahydrate and 1.1-1.3 parts of 1,10-phenanthroline. The invention further discloses application of the manganese series phosphating solution in phosphating treatment of high-chromium alloy steel workpieces. The manganese series phosphating solution can smoothly damage a protective oxidization film of chromated nickel, the polarization potential of the steel and iron surface can also be lowered, the manganese series phosphating solution is used for performing phosphating treatment onhigh-chromium alloy steel, the film forming speed is high, and thickness of a formed phosphating film is large, and at least can reach 17 microns or above. In addition, the manganese series phosphating solution is used for phosphating treatment, phosphating slag is not likely to be generated, and the application prospects are extremely wide.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of metal materials, in particular to a manganese-based phosphating solution and the application of the manganese-based phosphating solution in the phosphating treatment of high-chromium alloy steel workpieces. Background technique [0002] In the petroleum industry, most of the existing petroleum pipe hoops are made of low-chromium alloy steels such as T95 and N80. The phosphating treatment of these low-chromium alloy steels uses high-temperature manganese-based phosphating solution. [0003] The obtained phosphating film is continuous and dense, and has good wear resistance and corrosion resistance. With the development of the times, low-chromium alloy steel for oil pipe hoops can no longer meet the needs of practical applications. Therefore, high-chromium alloy steel oil pipe hoops made of P110, V150, and V175 have appeared. For these oil pipe hoops, if still Using the existing high-te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/05
CPCC23C22/05
Inventor 许峻豪
Owner HUNAN JINHUA SCI & TECH GRP
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