[go: up one dir, main page]

EP2075353A1 - Method for treatment of a surface area of steel - Google Patents

Method for treatment of a surface area of steel Download PDF

Info

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Withdrawn
Application number
EP07123351A
Other languages
German (de)
French (fr)
Inventor
Shantanu Bhowmik
Johannes Aaldert Poulis
Rinze Benedictus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technische Universiteit Delft
Original Assignee
Technische Universiteit Delft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Technische Universiteit Delft filed Critical Technische Universiteit Delft
Priority to EP07123351A priority Critical patent/EP2075353A1/en
Publication of EP2075353A1 publication Critical patent/EP2075353A1/en
Withdrawn legal-status Critical Current

Links

Images

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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

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 and Fig. 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 and 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.
  • What transpires from figures 3, 4 and 5 is that without pre-treatment of steel as shown in Fig. 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 in Fig. 4. Best results are however obtained when the steel surface area is exposed to an atmospheric plasma treatment which is clearly shown in Fig. 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)

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. Method according to claim 4, characterized in that the polishing is followed by ultrasonic cleaning for the removal of grease and/or dirt.
EP07123351A 2007-12-17 2007-12-17 Method for treatment of a surface area of steel Withdrawn EP2075353A1 (en)

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
EP (1) EP2075353A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 *

Similar Documents

Publication Publication Date Title
EP3333258A3 (en) Method for degrading or converting cellulosic material
ATE541591T1 (en) METHOD FOR REDUCING THE VIRAL AND MICROBIAL LOAD OF PANCREATIN
EP2243760A3 (en) Oxidation inhibition of carbon-carbon composites
CN105506471A (en) High-strength spring and processing technology thereof
WO2015073094A3 (en) Lattice materials and structures and related methods thereof
MY145093A (en) Adhesive composition and temporary fixation method of member using it
WO2009126875A3 (en) Pig and method for applying prophylactic surface treatments
WO2010058293A3 (en) Method and apparatus for washing fabrics using focused ultrasound
EP1927668A3 (en) Restoration method for deteriorated part and restoration apparatus for deteriorated part
MY128138A (en) Method for fighting against arthropods destructive of crops and compositions therefor
CN114959244A (en) Laser shock peening method for improving surface compressive stress layer depth and fatigue performance of 8Cr4Mo4V bearing steel
EP2075353A1 (en) Method for treatment of a surface area of steel
WO2020152631A3 (en) Systems and methods for applying energy to ovarian tissue
KR101923340B1 (en) Method for bonding stainless steel members and stainless steel
WO2008130378A3 (en) Method of mitigating the effects of damage in an article
CN106947930B (en) A kind of repair process method of titanium alloy plate deformation damage
CN106148936A (en) A kind of stainless steel material improving antiseptic property processes technique
JP4299758B2 (en) High strength bolt with excellent delayed fracture resistance and method for improving delayed fracture resistance
CN112779486A (en) Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition
CN108436212A (en) The welding method of aluminium alloy panel
WO2008132412A3 (en) Method for decontaminating a solution with respect to unwanted nucleic acids
WO2001002031A3 (en) Targeted anticalcification treatment
WO2005060497A3 (en) Improved rivet and coating technique
CN101363109A (en) Ion nitriding method of gray iron piston ring under multicomponent atmosphere
RU2049148C1 (en) Method for regeneration of power equipment members from carbon and low-alloy steels

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100202