CN2477931Y - Anti-corrosion pipe having chemical nickel plated phosphorus alloy layer for steam condenser - Google Patents
Anti-corrosion pipe having chemical nickel plated phosphorus alloy layer for steam condenser Download PDFInfo
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- CN2477931Y CN2477931Y CN 01201256 CN01201256U CN2477931Y CN 2477931 Y CN2477931 Y CN 2477931Y CN 01201256 CN01201256 CN 01201256 CN 01201256 U CN01201256 U CN 01201256U CN 2477931 Y CN2477931 Y CN 2477931Y
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- metal tube
- nickel
- alloy layer
- vapour condenser
- phosphorus alloy
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Abstract
An erosion resistant tubular product provided with an electroless plated phosphorous-nickel alloy layer for condensers, which comprises a heat exchange metal tube (1) used as the base body, characterized in that: an electroless plated phosphorous-nickel alloy layer, containing 6 to 12 weight percentage of phosphorous with nickel as the allowance is provided both on the inner and outer surfaces of the metal tube (1). The preferable thickness of the coated layer (2) is 15 to 35 micrometers, and the preferable material of the metal tube (1) can be one of the following: copper, copper alloy, steel and aluminum. The utility model proves excellent erosion resistance, with high surface rigidity, excellent wearing resistance, and without surface defects like pin holes, peeling off or cracks etc; besides, the coated layer has an even thickness and can be processed conveniently, with little contamination to the environment.
Description
The utility model relates to the tubing that heat exchanger-vapour condenser is used, and particularly has the vapour condenser corrosion protection tubing of chemical plating nickel-phosphorus alloy layer.
Vapour condenser as Thermal Power Station's key equipment generally uses copper or copper-alloy pipe-material manufacturing, and the cooling water that flows in the copper pipe circulates inside in service is generally the water or the underground water of rivers,lakes and seas, therefore has certain corrosivity.And the copper pipe outside is moved in the atmosphere that contains ammonia and oxygen, and ammonia and oxygen all have corrosivity to copper, thereby causes the inside and outside wall of copper pipe to be subjected in various degree burn into abrasion until the perforation leakage, so is directly threatening the normal safe operation of unit.Must carry out frequent maintenance owing to the corrosion of copper pipe and change copper pipe, should stop production, sizable again maintenance expenses, this is a great problem that Thermal Power Station faces always.For this reason, part power plant adopts expensive tubing such as Ti metal or monel, even so can not thoroughly solve the problem of corrosion.
The purpose of this utility model is at problems of the prior art, provides a kind of anti-corrosion performance the good corrosion protection tubing of the vapour condenser with chemical plating nickel-phosphorus alloy layer.
Designer of the present utility model finds through the further investigation back, can achieve the above object as long as adopt the method for chemical plating all to plate one deck ni-p alloy coating on the inside and outside surface of conventional vapour condenser with metal pipe, has so far just finished the utility model.
Basic technical scheme of the present utility model is as follows:
A kind of corrosion protection tubing of vapour condenser with chemical plating nickel-phosphorus alloy layer has the heat exchange metal tube as matrix, and wherein, all having one deck on the inside and outside surface of this metal tube is the chemical plating nickel-phosphorus alloy layer that nickel is formed by phosphorus and the surplus of 6-12 weight %.
Optimal technical scheme of the present utility model is as follows:
Aforesaid vapour condenser corrosion protection tubing, the thickness of wherein said chemical plating nickel-phosphorus alloy layer is between 15-35 μ m.
Aforesaid vapour condenser corrosion protection tubing, wherein said heat exchange metal tube is preferably any in copper pipe, copper alloy tube, steel pipe and the aluminum pipe.In copper alloy tube, brass tube more preferably; And in steel pipe, Low Carbon Steel Pipe more preferably.
At length explain the utility model below.
Main inventive point of the present utility model is all to form one deck chemical plating nickel-phosphorus alloy layer on the inside and outside surface of heat exchange metal tube.Those of ordinary skill in the corrosion protection field is known, nickel phosphor alloy has good corrosion resistance, but at industrial production sector, particularly in power industry department, still have no talent up to now and expect to solve by formation chemical plating nickel-phosphorus alloy layer on the inside and outside surface of heat-exchange tube the etching problem of heat-exchange tube.It is that the former coating uniformity is more much better than the latter that the utility model defines the reason that forms chemical plating nickel-phosphorus alloy layer rather than nickel-phosphorus alloy plating layer.When electroplating, the deposition rate of coating is accelerated along with the increase of current density, like this, for complex-shaped metallic substrates, there is bigger difference in its current density between different zones, inside for metal tube is all the more so, so adopt galvanoplastic to be difficult to form uniform coating in the inside of metal tube, chemical plating then can overcome this shortcoming.In addition, nickel phosphorus ratio in the corrosion resistance of nickel-phosphorus alloy coating and intensity thereof and the alloy has much relations, total amount in nickel and phosphorus is 100 weight %, when the content of phosphorus is lower than 6 weight %, its corrosion resistance is good inadequately, and when phosphorus content surpassed 12 weight %, its wear strength reduced, therefore phosphorus content is limited in the scope of 6-12 weight %, surplus is a nickel.The thickness of nickel-phosphorus alloy coating is not particularly limited, as long as formed nickel phosphorus than the coating in above-mentioned scope, just can obviously improve the corrosion stability of this metal tube, but its thickness is preferably between 15-35 μ m.When its thickness is lower than 15 μ m, obvious inadequately to the raising effect in metal tube life-span against corrosion, and its thickness greater than 35 μ m also need not, therefore, the thickness of this coating is preferably between the 15-35 μ m.
The material of metal tube does not have any restriction, no matter be any metal tube, and all can be, formed nickel-phosphorus alloy coating on the outer surface and have good corrosion stability owing within it.But consider from temperature conductivity, processibility and price etc. are many-sided, preferably copper, Cuprum alloy, steel and aluminium.In Cuprum alloy, be more preferably brass.In steel, be more preferably low carbon steel.
Compare with the prior art of related domain, the vapour condenser that the utlity model has the chemical plating nickel-phosphorus alloy layer has following many-sided advantage with corrosion protection tubing:
1, You Yi decay resistance;
2, high surface hardness (HV550) and excellent wear resistance;
3, free of pinholes, peel off, crackle and other defect;
4, covering power is strong, and thickness is very even, can keep the shape of matrix fully;
5, technological operation is easy, and cost of production is lower, has substituted expensive alloy material;
6, production process is little to the pollution of environment, without toxic chemicals such as cyanide and chromic acid,
Its waste water is handled a little and can be reached national specified discharge standard.
Explain the utility model below in conjunction with accompanying drawing.
Fig. 1 is the cross-sectional view of vapour condenser of the present utility model with corrosion protection tubing.
Fig. 2 is the sectional view along the A-A direction of Fig. 1.
In Fig. 1 and Fig. 2, the 1st, nickel-phosphorus alloy coating; The 2nd, as the vapour condenser of substrate heat exchange metal tube.
Enumerate embodiment below and further explain the utility model, but the utility model is not subjected to these embodiments and the routine restriction of test with the test example.
Embodiment 1
Use is of a size of the brass tube of diameter 10mm, thick 1mm as blank, carries out the chemical plating nickel-phosphorus alloy layer and handle after it is carried out processing such as oil removing, washing, pickling, washing.Carrying out using plating bath when this chemical plating is handled with following chemical composition
Component content
Nickelous sulfate 30 grams per liters
Inferior sodium phosphate 30 grams per liters
Sodium acetate 15 grams per liters
Natrium citricum 15 grams per liters
18 milliliters/liter of lactic acid
Water surplus
When carrying out chemical plating, with the acidity adjustment of plating bath to pH=4.7, and with its temperature maintenance at 85 ℃, the brass tube of above-mentioned specification is put into above-mentioned plating bath soaked 100 minutes.As a result, all plated the layer of even ni-p alloy coating on the inside and outside surface of brass tube.After measured, the phosphorus content in this coating is 10.5 weight %, and surplus is a nickel.And the thickness that records this coating is 25 μ m, and hardness is HV550.
Embodiment 2
Except replacing embodiment 1 the brass tube with fine copper (red copper) pipe, all the other carry out according to the condition identical with embodiment 1.The result has all formed all identical with embodiment 1 nickel-phosphorus alloy coating of one deck chemical composition, thickness and hardness on the inside and outside surface of copper pipe.
Embodiment 3
Except replacing embodiment 1 the brass tube with low carbon steel (A3) pipe, all the other carry out according to the condition identical with embodiment 1.The result has all formed all identical with embodiment 1 nickel-phosphorus alloy coating of one deck chemical composition, thickness and hardness on the inside and outside surface of Low Carbon Steel Pipe.
Embodiment 4
Except replacing with aluminum pipe embodiment 1 the brass tube, all the other carry out according to the condition identical with embodiment 1.The result has all formed all identical with embodiment 1 nickel-phosphorus alloy coating of one deck chemical composition, thickness and hardness on the inside and outside surface of aluminum pipe.
Test example 1 corrosion test
Use the brass tube that has nickel-phosphorus alloy coating that makes among the embodiment 1 and the trade mark Stainless Steel Tube as 1Cr18Ni9Ti, test according to the condition shown in the following table 1, carry out 48 hours corrosion test continuously, it is the rate of corrosion of unit that the rate of corrosion that records was converted into millimeter/year.The results are shown in Table 1.
Table 1
| The medium-weight % aqueous solution | Temperature ℃ | Rate of corrosion (millimeter/year) | |
| Embodiment's 1 product | 1Cr18Ni9Ti | ||
| 3% sodium chloride | Boiling | 0.00286 | 0.05 |
| 40% sodium hydroxide | Boiling | 0.048 | 1.5 |
| 37% hydrochloric acid | 30 | 0.0407 | 1.7 |
| 10% sulfuric acid | 30 | 0.0424 | 1.5 |
| 10% nitric acid | 30 | 72.45 | 0.05 |
As can be seen from Table 1, in the aqueous solution of sodium chloride, sodium hydroxide, hydrochloric acid and sulfuric acid, the corrosion resistance of nickel phosphor alloy has all surpassed stainless steel significantly.Can judge that thus vapour condenser of the present utility model can tolerate corrosion under the vapour condenser operating conditions condition fully with corrosion protection tubing.
Test routine 2-4
The product that obtains with embodiment 2,3,4 replaces embodiment 1 product to carry out the test identical with test example 1 respectively, has all obtained and tested the almost same result of example 1.Can judge thus,,, just can obtain same corrosion resisting property within it as long as, form nickel-phosphorus alloy coating on the outer surface no matter the material of metal tube is copper, Cuprum alloy, steel or aluminium.
Claims (8)
1, a kind of corrosion protection tubing of vapour condenser with chemical plating nickel-phosphorus alloy layer, has heat exchange metal tube (1) as matrix, it is characterized in that all having one deck on the inside and outside surface of this metal tube (1) is the chemical plating nickel-phosphorus alloy layer (2) that nickel is formed by phosphorus and the surplus of 6-12 weight %.
2, vapour condenser as claimed in claim 1 corrosion protection tubing is characterized in that, the thickness of wherein said chemical plating nickel-phosphorus alloy layer (2) is between 15-35 μ m.
3, vapour condenser as claimed in claim 1 or 2 corrosion protection tubing is characterized in that, wherein said metal tube (1) is a copper pipe.
4, vapour condenser as claimed in claim 1 or 2 corrosion protection tubing is characterized in that, wherein said metal tube (1) is a copper alloy tube.
5, vapour condenser as claimed in claim 4 corrosion protection tubing is characterized in that, wherein said metal tube (1) is a brass tube.
6, vapour condenser as claimed in claim 1 or 2 corrosion protection tubing is characterized in that, wherein said metal tube (1) is a steel pipe.
7, vapour condenser as claimed in claim 6 corrosion protection tubing is characterized in that, wherein said metal tube (1) is a Low Carbon Steel Pipe.
8, vapour condenser as claimed in claim 1 or 2 corrosion protection tubing is characterized in that, wherein said metal tube (1) is an aluminum pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01201256 CN2477931Y (en) | 2001-02-09 | 2001-02-09 | Anti-corrosion pipe having chemical nickel plated phosphorus alloy layer for steam condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01201256 CN2477931Y (en) | 2001-02-09 | 2001-02-09 | Anti-corrosion pipe having chemical nickel plated phosphorus alloy layer for steam condenser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2477931Y true CN2477931Y (en) | 2002-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01201256 Expired - Fee Related CN2477931Y (en) | 2001-02-09 | 2001-02-09 | Anti-corrosion pipe having chemical nickel plated phosphorus alloy layer for steam condenser |
Country Status (1)
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|---|---|
| CN (1) | CN2477931Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353136C (en) * | 2006-01-20 | 2007-12-05 | 北京建筑工程学院 | Anti-corrosion copper condensing heat exchanger utilizing smoke heat energy, and manufacturing method thereof |
| CN102207341A (en) * | 2011-07-01 | 2011-10-05 | 中国华能集团清洁能源技术研究院有限公司 | Medium-high-temperature through type metal solar collector tube |
| CN104372314A (en) * | 2013-08-12 | 2015-02-25 | 国家电网公司 | Condenser brass tube chemical nickel plating method |
-
2001
- 2001-02-09 CN CN 01201256 patent/CN2477931Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353136C (en) * | 2006-01-20 | 2007-12-05 | 北京建筑工程学院 | Anti-corrosion copper condensing heat exchanger utilizing smoke heat energy, and manufacturing method thereof |
| CN102207341A (en) * | 2011-07-01 | 2011-10-05 | 中国华能集团清洁能源技术研究院有限公司 | Medium-high-temperature through type metal solar collector tube |
| CN102207341B (en) * | 2011-07-01 | 2012-12-19 | 中国华能集团清洁能源技术研究院有限公司 | Medium-high-temperature through type metal solar collector tube |
| CN104372314A (en) * | 2013-08-12 | 2015-02-25 | 国家电网公司 | Condenser brass tube chemical nickel plating method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |