CN106521467B - A kind of casing inner surface anti-corrosive treatment method - Google Patents
A kind of casing inner surface anti-corrosive treatment method Download PDFInfo
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Abstract
The present invention relates to a kind of casing inner surface anti-corrosive treatment method, which includes successively being cleaned in sequence using organic solvent, chemical reagent, hot water, cold water to casing surfaces externally and internally, removes surface grease；Casing surfaces externally and internally is completely immersed in fill 30-40g/L bis- be hydrated sodium dichromate, bis- hydrated manganese sulfate of 8-12g/L, 1.8-2.2g/L bitter salt solution treatment trough in; the treatment trough is equipped with inlet and liquid outlet; after casing surfaces externally and internally is completely immersed in treatment trough; solution flows into treatment trough from inlet; and liquid outlet is flowed to by the inner surface of casing; so that the solution in treatment trough keeps mobility; it obtains casing inner surface and reacting for solution is more abundant, it is ensured that casing inner wall overlay film is uniform；Casing after processed by the invention, surfaces externally and internally form the protective film of one layer of black, and the protective film good corrosion resistance, surface is without dust, and neutral salt spray test was up to 150 hours.
Description
Technical field
The present invention relates to the field of metal surface anticorrosive processing, particularly a kind of casing inner surface anti-corrosion treatment sides
Method.
Background technique
In Field of Aviation Manufacturing, to meet the requirement that Aircraft Quality is light, damping performance is good, to absorb impact load-carrying ability high,
Most components are manufactured using magnesium alloy, and magnesium alloy, which has, makes that density is small, and density is low, and damping performance is good, electrical and thermal conductivity performance
Well, specific strength is high, and, good heat dissipation bigger than elasticity modulus, absorb shock resistance is good, absorbs impact the high feature of load-carrying ability, in aviation, boat
It, transport, the industrial circles such as chemical industry have a wide range of applications.But the electric grade current potential of magnesium alloy is very low (- 2.34KV), causes it
Chemical stability is very poor, and corrosion resisting property is poor, is easy to aoxidize, and in most of media, magnesium alloy is all unstable.
Casing is as an important component on gas-turbine unit, the thin wall cylinder of a usually cylinder or cone
Body is in for a long time rich in the environment of the corrosive gas such as nitrogen dioxide, needs more while bearing the load such as pneumatic, vibration
Good corrosion resistance.Existing casing is mainly handled casing surface using spray painting, electroxidation or chemical composition coating, is processed
Often there is spraying or the non-uniform problem of overlay film in molding casing inner wall, and the inner wall exactly worst place of environment, because
This needs to carry out special processing, but traditional method for carrying out chemical conversion treatment to casing surface, and there are inner surface overlay films
The disadvantages of uneven, and the cleaning quality of casing surfaces externally and internally, casing inner surface and reaction solution come into full contact with, and are decision machines
The key of casket inner surface compound film quality.
Summary of the invention
That technical problem to be solved by the invention is to provide a kind of surface corrosion resistances is good, easy to operate, overlay film uniformly and
Efficient casing inner surface anti-corrosive treatment method.
Casing inner surface anti-corrosive treatment method provided by the invention, steps are as follows:
A. casing surfaces externally and internally is cleaned using organic solvent；
B. casing surfaces externally and internally grease stain is removed using chemical reagent；
C. casing surfaces externally and internally is cleaned using hot water (80-100 DEG C), removes remaining organic solvent and chemistry examination
Agent；
D. (10-25 DEG C) cleaning casing surfaces externally and internally of cold water is used；
E. casing surfaces externally and internally is completely immersed in treatment trough, 30-40g/L bis- is filled in the treatment trough and is hydrated dichromic acid
Sodium, bis- hydrated manganese sulfate of 8-12g/L, 1.8-2.2g/L bitter salt solution, which casing is completely covered, this is molten
The pH value of liquid is 4-5.5, and temperature is 40 DEG C -50 DEG C, is impregnated 60-80 minutes, the surfaces externally and internally film layer of the casing becomes at this time
Black；
F. casing is taken out, using cold water wash casing surfaces externally and internally；
G. hot water cleaning machine casket surfaces externally and internally is used, and is dried, examines.
Further, the organic solvent in step A is one of alcohol or acetone, can remove the rouge of casing surfaces externally and internally
Soluble substance, and be easy to volatilize.
Chemical reagent in step B is that sodium carbonate liquor of short duration can prevent inside and outside casing while removing surface grease
Surface corrosion.
Further, in step E, the treatment trough is equipped with inlet and liquid outlet, is completely immersed in casing surfaces externally and internally
After treatment trough, the solution flows into treatment trough from inlet, and flows to liquid outlet by the inner surface of casing, so that in treatment trough
Solution keep mobility, it is ensured that the inner surface of casing is sufficiently reacted with solution, guarantee casing inner surface compound film quality.
Further, in step E, the temperature for controlling the solution is 42 DEG C -48 DEG C, obtains more particularly suitable reaction environment,
Gained casing surfaces externally and internally thicknesses of layers is controlled at 0.5-3 microns, and film layer appearance is black and bright, the more general magnesium alloy oxygen of anti-corrosion ability
Change technology is high, ensures anti-corrosion effect.
The technical effect that the present invention has: casing inner surface anti-corrosive treatment method of the invention is easy to operate, by solution
It flows, so that casing inner surface and reacting for solution are more abundant, it is ensured that casing inner wall overlay film is uniform；It is processed by the invention
Casing afterwards forms the protective film of one layer of black in the surfaces externally and internally of the casing, and the protective film good corrosion resistance, surface is without extension
Ash, neutral salt spray test was up to 200 hours or more；It is good with paint layer binding force, neutral salt spray test 1500 hours or more nothings after japanning
Peeling, foaming phenomena.
Specific embodiment
Casing is handled as follows embodiment 1:
In sequence successively using industrial alcohol, industrial sodium carbonate solution, hot water (80 DEG C), cold water (10 DEG C) in casing
Outer surface is cleaned, and surface grease is removed；Casing surfaces externally and internally is completely immersed in and fills 30g/L bis- hydration sodium dichromate, 8g/
Bis- hydrated manganese sulfate of L, 2g/L bitter salt solution treatment trough in, the treatment trough be equipped with inlet and liquid outlet,
After casing surfaces externally and internally is completely immersed in treatment trough, solution flows into treatment trough from inlet, and is flowed to out by the inner surface of casing
Liquid mouth, so that the solution in treatment trough keeps mobility, it is ensured that the inner surface of casing is sufficiently reacted with solution, guarantees table in casing
Face compound film quality.The pH value of solution is adjusted to be 4, temperature is 40 DEG C, impregnates 80 minutes, casing is taken out, at this time casing
Surfaces externally and internally film layer becomes black, successively uses cold water, hot water cleaning machine casket surfaces externally and internally, is dried and examines to casing,
Obtained casing inner surface thicknesses of layers is 0.9 micron, and outer surface thicknesses of layers is 1.3 microns.
Surface is without dust, and neutral salt spray test was up to 200 hours；It is good with paint layer binding force, neutral salt spray test after japanning
1500 hours without peeling, foaming phenomena.
Casing is handled as follows embodiment 2:
In sequence successively using industrial acetone, industrial sodium carbonate solution, hot water (90 DEG C), cold water (10 DEG C) in casing
Outer surface is cleaned, and surface grease is removed；Casing surfaces externally and internally is completely immersed in fill 35g/L bis- be hydrated sodium dichromate,
Bis- hydrated manganese sulfate of 10g/L, 2g/L bitter salt solution treatment trough in, which is equipped with inlet and liquid out
Mouthful, after casing surfaces externally and internally is completely immersed in treatment trough, solution flows into treatment trough from inlet, and passes through the inner surface stream of casing
To liquid outlet, so that the solution in treatment trough keeps mobility, it is ensured that the inner surface of casing is sufficiently reacted with solution, guarantees casing
Inner surface compound film quality.The pH value of solution is adjusted to be 4.5, temperature is 42 DEG C, impregnates 60 minutes, casing is taken out, at this time
The surfaces externally and internally film layer of casing becomes black, successively uses cold water, hot water cleaning machine casket surfaces externally and internally, casing is dried simultaneously
It examines, obtained casing inner surface thicknesses of layers is 1.2 microns, and outer surface thicknesses of layers is 1.4 microns.
Surface is without dust, and neutral salt spray test was up to 220 hours；It is good with paint layer binding force, neutral salt spray test after japanning
1600 hours without peeling, foaming phenomena.
Casing is handled as follows embodiment 3:
In sequence successively using industrial acetone, industrial sodium carbonate solution, hot water (80 DEG C), cold water (15 DEG C) in casing
Outer surface is cleaned, and surface grease is removed；Casing surfaces externally and internally is completely immersed in fill 40g/L bis- be hydrated sodium dichromate,
Bis- hydrated manganese sulfate of 12g/L, 2.2g/L bitter salt solution treatment trough in, which is equipped with inlet and liquid out
Mouthful, after casing surfaces externally and internally is completely immersed in treatment trough, solution flows into treatment trough from inlet, and passes through the inner surface stream of casing
To liquid outlet, so that the solution in treatment trough keeps mobility, it is ensured that the inner surface of casing is sufficiently reacted with solution, guarantees casing
Inner surface compound film quality.The pH value of solution is adjusted to be 5, temperature is 48 DEG C, impregnates 60 minutes, casing is taken out, this opportunity
The surfaces externally and internally film layer of casket becomes black, successively uses cold water, hot water cleaning machine casket surfaces externally and internally, is dried and examines to casing
It tests, obtained casing inner surface thicknesses of layers is 2.2 microns, and outer surface thicknesses of layers is 2.6 microns.
Surface is without dust, and neutral salt spray test was up to 240 hours；It is good with paint layer binding force, neutral salt spray test after japanning
2000 hours without peeling, foaming phenomena.
Casing is handled as follows embodiment 4:
In sequence successively using industrial acetone, industrial sodium carbonate solution, hot water (90 DEG C), cold water (20 DEG C) in casing
Outer surface is cleaned, and surface grease is removed；Casing surfaces externally and internally is completely immersed in fill 40g/L bis- be hydrated sodium dichromate,
Bis- hydrated manganese sulfate of 12g/L, 2.2g/L bitter salt solution treatment trough in, which is equipped with inlet and liquid out
Mouthful, after casing surfaces externally and internally is completely immersed in treatment trough, solution flows into treatment trough from inlet, and passes through the inner surface stream of casing
To liquid outlet, so that the solution in treatment trough keeps mobility, it is ensured that the inner surface of casing is sufficiently reacted with solution, guarantees casing
Inner surface compound film quality.The pH value of solution is adjusted to be 5.5, temperature is 50 DEG C, impregnates 60 minutes, casing is taken out, at this time
The surfaces externally and internally film layer of casing becomes black, successively uses cold water, hot water cleaning machine casket surfaces externally and internally, casing is dried simultaneously
It examines, obtained casing inner surface thicknesses of layers is 1.5 microns, and outer surface thicknesses of layers is 1.6 microns.
Surface is without dust, and neutral salt spray test was up to 230 hours；It is good with paint layer binding force, neutral salt spray test after japanning
1600 hours without peeling, foaming phenomena.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to of the invention
The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair
The obvious changes or variations that bright spirit is extended out are still in protection scope of the present invention.
Claims (2)
1. a kind of casing inner surface anti-corrosive treatment method, which comprises the steps of:
A. casing surfaces externally and internally is cleaned using organic solvent；
B. casing surfaces externally and internally grease stain is removed using chemical reagent；
C. casing surfaces externally and internally is cleaned using 80-100 DEG C of hot water, removes remaining organic solvent and chemical reagent；
D. 10-25 DEG C of cold water wash casing surfaces externally and internally is used；
E. casing surfaces externally and internally is completely immersed in treatment trough, 30-40g/L bis- is filled in the treatment trough and is hydrated sodium dichromate, 8-
Casing is completely covered for the solution of bis- hydrated manganese sulfate of 12g/L, 1.8-2.2g/L bitter salt, the solution, the solution
PH value is 4-5.5, and temperature is 40 DEG C -50 DEG C, is impregnated 60-80 minutes；
F. casing is taken out, using cold water wash casing surfaces externally and internally；
G. hot water cleaning machine casket surfaces externally and internally is used, and is dried, examines；
Organic solvent in step A is one of alcohol or acetone；
Chemical reagent is sodium carbonate liquor in step B；
In step E, the treatment trough is equipped with inlet and liquid outlet, described after casing surfaces externally and internally is completely immersed in treatment trough
Solution flows into treatment trough from inlet, and flows to liquid outlet by the inner surface of casing.
2. the method according to claim 1, wherein the temperature of the solution is 42 DEG C -48 DEG C in step E.
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| CN201510584474.XA CN106521467B (en) | 2015-09-15 | 2015-09-15 | A kind of casing inner surface anti-corrosive treatment method |
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| CN201510584474.XA CN106521467B (en) | 2015-09-15 | 2015-09-15 | A kind of casing inner surface anti-corrosive treatment method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632168A (en) * | 2004-12-28 | 2005-06-29 | 哈尔滨工业大学 | Composite processing method for increasing corrosion resistance for magnesium alloys |
| CN102453937A (en) * | 2010-10-18 | 2012-05-16 | 张国斌 | Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy |
| CN102453893A (en) * | 2010-10-18 | 2012-05-16 | 王振宇 | Surface treatment method of magnesium and magnesium alloy |
| CN102691056A (en) * | 2012-06-13 | 2012-09-26 | 常州兰翔机械有限责任公司 | Method for treating chemical conversion coating on surface of magnesium alloy |
| CN102747351A (en) * | 2012-07-09 | 2012-10-24 | 北方光电集团有限公司 | Magnesium alloy black oxidation technique |
-
2015
- 2015-09-15 CN CN201510584474.XA patent/CN106521467B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632168A (en) * | 2004-12-28 | 2005-06-29 | 哈尔滨工业大学 | Composite processing method for increasing corrosion resistance for magnesium alloys |
| CN102453937A (en) * | 2010-10-18 | 2012-05-16 | 张国斌 | Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy |
| CN102453893A (en) * | 2010-10-18 | 2012-05-16 | 王振宇 | Surface treatment method of magnesium and magnesium alloy |
| CN102691056A (en) * | 2012-06-13 | 2012-09-26 | 常州兰翔机械有限责任公司 | Method for treating chemical conversion coating on surface of magnesium alloy |
| CN102747351A (en) * | 2012-07-09 | 2012-10-24 | 北方光电集团有限公司 | Magnesium alloy black oxidation technique |
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Address after: 213000 the Yellow River Middle Road, Xinbei District, Jiangsu, China, No. 8, No. Applicant after: Changzhou Hangfa China Lanxiang machinery limited liability company Address before: 213000 the Yellow River Middle Road, Xinbei District, Jiangsu, China, No. 8, No. Applicant before: Changzhou Lanxiang Machinery Co.,Ltd. |
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