EP2075353A1 - Method for treatment of a surface area of steel - Google Patents
Method for treatment of a surface area of steel Download PDFInfo
- Publication number
- EP2075353A1 EP2075353A1 EP07123351A EP07123351A EP2075353A1 EP 2075353 A1 EP2075353 A1 EP 2075353A1 EP 07123351 A EP07123351 A EP 07123351A EP 07123351 A EP07123351 A EP 07123351A EP 2075353 A1 EP2075353 A1 EP 2075353A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- surface area
- plasma treatment
- treatment
- polishing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
Definitions
- the invention relates to a method for treatment of a surface area of steel by polishing said surface area and performing a plasma treatment of said surface area.
- the plasma treatment that is carried out in the method of the invention is performed at at least atmospheric conditions.
- the method of the invention is carried out with a plasma treatment occurring at a power of approximately 300 watt and for a duration of at least 20 minutes.
- a preferred exposure time is considered to be 30 minutes.
- the plasma treatment is carried out at a pressure in the range of 3-5 bar.
- the polishing to be carried out prior to the plasma treatment is a mechanical polishing so as to remove oxides from the steel surface area.
- polishing is followed by ultrasonic cleaning for the removal of grease and/or dirt.
- Fig. 1 the influence is shown of applying atmospheric pressure plasma treatment and low pressure plasma treatment and its effect on the adhesive bond strengths of the steels so treated.
- the figure also shows a left bar representing the adhesive bond strength of steel which is untreated. What clearly follows from the figure is that an improvement of the adhesive bond strength of steel occurs when a low pressure plasma treatment is applied and that this bond strength may be further increased by applying an atmospheric plasma treatment of such steel.
- a comparative example of the durability of the adhesive bond strength is shown of a steel that is exposed to atmospheric plasma treatment according to the invention.
- the figure shows said adhesive bond strength at respectively ambient conditions, low temperature conditions, elevated temperature conditions and under a thermal fatigue test.
- the adhesive bonds were separately exposed to said low temperature (-196°C), and said elevated temperature (+200°C) for approximately 100 hours, and the thermal fatigue test was carried out by exposing the joints of a steel bonded to another steel surface under 10 cycles of varying loads for a duration of two hours at the above-mentioned temperatures. It can be observed that the adhesive bond strength of the steel retains 96-98% of the bond strength that is present at ambient conditions.
- Fig. 3 relates to an atmospheric plasma exposed steel surface area
- Fig. 4 relates to a low pressure plasma exposed steel surface area
- Fig. 5 relates to an unmodified steel surface area.
- Both Fig. 3, Fig. 4 and Fig. 5 show for the just-mentioned steels the adhesive bond strength at ambient condition and also when subjected to a high energy radiation with gamma and neutron radiation, and further when exposed to a Ringer's solution at an elevated temperature of 80°C for four weeks.
Abstract
The invention relates to a method for treatment of a surface area of steel by polishing said surface area and performing a plasma treatment of said surface area wherein the plasma treatment is performed at at least atmospheric conditions and wherein the plasma treatment is carried out at a power of approximately 300 W and for a duration of at least 20 minutes, and preferably 30 minutes.
Description
- The invention relates to a method for treatment of a surface area of steel by polishing said surface area and performing a plasma treatment of said surface area.
- Such a method is known in the art and is applied to increase the adhesive bond durability of the steel particularly under harsh climatic conditions.
- According to the invention a modification of this known method is proposed in order to further improve the adhesive bond durability of the steel and to attain further advantages as will become apparent from the following disclosure.
- In a first aspect of the invention the plasma treatment that is carried out in the method of the invention is performed at at least atmospheric conditions. This provides the advantage firstly that the treatment can take place in the open air and that it may therefore be carried out in a simpler fashion and moreover cheaper than the known alternative of vacuum plasma treatment. A further advantage is that the method is applicable to steel surface areas having quite large dimensions.
- Preferably the method of the invention is carried out with a plasma treatment occurring at a power of approximately 300 watt and for a duration of at least 20 minutes. A preferred exposure time is considered to be 30 minutes.
- It may also be preferable that the plasma treatment is carried out at a pressure in the range of 3-5 bar.
- In order to support and promote the effective plasma treatment according to the method of the invention it is desirable that the polishing to be carried out prior to the plasma treatment is a mechanical polishing so as to remove oxides from the steel surface area.
- It may further be advantageous that the polishing is followed by ultrasonic cleaning for the removal of grease and/or dirt.
- The invention will hereinafter be further elucidated with reference to the attached
figures 1-5 wherein each figure shows comparatively the adhesive bond strengths of steel depending on a particular treatment or absence of treatment of said steel. - With reference first to
Fig. 1 the influence is shown of applying atmospheric pressure plasma treatment and low pressure plasma treatment and its effect on the adhesive bond strengths of the steels so treated. The figure also shows a left bar representing the adhesive bond strength of steel which is untreated. What clearly follows from the figure is that an improvement of the adhesive bond strength of steel occurs when a low pressure plasma treatment is applied and that this bond strength may be further increased by applying an atmospheric plasma treatment of such steel. - With reference now to
Fig. 2 a comparative example of the durability of the adhesive bond strength is shown of a steel that is exposed to atmospheric plasma treatment according to the invention. The figure shows said adhesive bond strength at respectively ambient conditions, low temperature conditions, elevated temperature conditions and under a thermal fatigue test. The adhesive bonds were separately exposed to said low temperature (-196°C), and said elevated temperature (+200°C) for approximately 100 hours, and the thermal fatigue test was carried out by exposing the joints of a steel bonded to another steel surface under 10 cycles of varying loads for a duration of two hours at the above-mentioned temperatures. It can be observed that the adhesive bond strength of the steel retains 96-98% of the bond strength that is present at ambient conditions. -
Fig. 3, Fig. 4 andFig. 5 are to be looked upon in combination.Fig. 3 relates to an atmospheric plasma exposed steel surface area,Fig. 4 relates to a low pressure plasma exposed steel surface area andFig. 5 relates to an unmodified steel surface area. - Both
Fig. 3, Fig. 4 andFig. 5 show for the just-mentioned steels the adhesive bond strength at ambient condition and also when subjected to a high energy radiation with gamma and neutron radiation, and further when exposed to a Ringer's solution at an elevated temperature of 80°C for four weeks. - What transpires from
figures 3, 4 and5 is that without pre-treatment of steel as shown inFig. 5 there is a comparatively strong deterioration of the adhesive bond strengths whereas the deterioration of the adhesive bond strengths is less severe when the steel is subjected to a low-pressure plasma treatment as shown inFig. 4 . Best results are however obtained when the steel surface area is exposed to an atmospheric plasma treatment which is clearly shown inFig. 3 . - It can therefore be concluded that the pre-treatment of steel by atmospheric pressure plasma treatment is highly beneficial to attain a durable and strong adhesive bond.
Claims (5)
- Method for treatment of a surface area of steel by polishing said surface area and performing a plasma treatment of said surface area, characterized in that the plasma treatment is performed at at least atmospheric conditions.
- Method according to claim 1, characterized in that the plasma treatment is carried out at a power of approximately 300 W and for a duration of at least 20 minutes, and preferably 30 minutes.
- Method according to claim 1 or 2, characterized in that the plasma treatment is carried out at a pressure in the range of 3-5 bar.
- Method according to anyone of claims 1-3, characterized in that the polishing is a mechanical polishing so as to remove oxides from the steel surface area.
- Method according to claim 4, characterized in that the polishing is followed by ultrasonic cleaning for the removal of grease and/or dirt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07123351A EP2075353A1 (en) | 2007-12-17 | 2007-12-17 | Method for treatment of a surface area of steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07123351A EP2075353A1 (en) | 2007-12-17 | 2007-12-17 | Method for treatment of a surface area of steel |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2075353A1 true EP2075353A1 (en) | 2009-07-01 |
Family
ID=39410065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07123351A Withdrawn EP2075353A1 (en) | 2007-12-17 | 2007-12-17 | Method for treatment of a surface area of steel |
Country Status (1)
Country | Link |
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EP (1) | EP2075353A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5387842A (en) * | 1993-05-28 | 1995-02-07 | The University Of Tennessee Research Corp. | Steady-state, glow discharge plasma |
US5938854A (en) * | 1993-05-28 | 1999-08-17 | The University Of Tennessee Research Corporation | Method and apparatus for cleaning surfaces with a glow discharge plasma at one atmosphere of pressure |
WO2001012350A1 (en) * | 1999-08-16 | 2001-02-22 | The University Of Tennessee Research Corporation | Cleaning surfaces with a thermal-non-equilibrium glow discharge plasma at high pressure |
WO2002094455A1 (en) * | 2001-05-18 | 2002-11-28 | Plasma Tech Co., Ltd. | Process for plasma treatment and apparatus |
US20040003828A1 (en) * | 2002-03-21 | 2004-01-08 | Jackson David P. | Precision surface treatments using dense fluids and a plasma |
DE102005011887A1 (en) * | 2005-03-15 | 2006-09-21 | Linde Ag | Reactor`s surface cleaning method, involves simultaneously cleaning surface by air plasma or low vacuum plasma, and mechanically stressing surface by rotating round brush, metallic flat brush, scrubber, scraper or other cleaning equipment |
-
2007
- 2007-12-17 EP EP07123351A patent/EP2075353A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5387842A (en) * | 1993-05-28 | 1995-02-07 | The University Of Tennessee Research Corp. | Steady-state, glow discharge plasma |
US5938854A (en) * | 1993-05-28 | 1999-08-17 | The University Of Tennessee Research Corporation | Method and apparatus for cleaning surfaces with a glow discharge plasma at one atmosphere of pressure |
WO2001012350A1 (en) * | 1999-08-16 | 2001-02-22 | The University Of Tennessee Research Corporation | Cleaning surfaces with a thermal-non-equilibrium glow discharge plasma at high pressure |
WO2002094455A1 (en) * | 2001-05-18 | 2002-11-28 | Plasma Tech Co., Ltd. | Process for plasma treatment and apparatus |
US20040003828A1 (en) * | 2002-03-21 | 2004-01-08 | Jackson David P. | Precision surface treatments using dense fluids and a plasma |
DE102005011887A1 (en) * | 2005-03-15 | 2006-09-21 | Linde Ag | Reactor`s surface cleaning method, involves simultaneously cleaning surface by air plasma or low vacuum plasma, and mechanically stressing surface by rotating round brush, metallic flat brush, scrubber, scraper or other cleaning equipment |
Non-Patent Citations (1)
Title |
---|
"CLEANING PROCEESES FOR STAINLESS STEEL SURGICAL SUTURE NEEDLES", RESEARCH DISCLOSURE, MASON PUBLICATIONS, HAMPSHIRE, GB, no. 409, 1 May 1998 (1998-05-01), pages 563 - 569, XP000824695, ISSN: 0374-4353 * |
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