EP2864522A2 - Procédé pour le traitement de surfaces métalliques pour conférer à celles-ci une hydrophobicité et une oléophobicité élevées - Google Patents

Procédé pour le traitement de surfaces métalliques pour conférer à celles-ci une hydrophobicité et une oléophobicité élevées

Info

Publication number
EP2864522A2
EP2864522A2 EP13756700.4A EP13756700A EP2864522A2 EP 2864522 A2 EP2864522 A2 EP 2864522A2 EP 13756700 A EP13756700 A EP 13756700A EP 2864522 A2 EP2864522 A2 EP 2864522A2
Authority
EP
European Patent Office
Prior art keywords
coating
treatment
metal surfaces
treated
metal
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.)
Granted
Application number
EP13756700.4A
Other languages
German (de)
English (en)
Other versions
EP2864522B1 (fr
Inventor
Mariarosa RAIMONDO
Federica Bezzi
Magda Blosi
Claudio MINGAZZI
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.)
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Consiglio Nazionale delle Richerche CNR
Original Assignee
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Consiglio Nazionale delle Richerche CNR
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 Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA, Consiglio Nazionale delle Richerche CNR filed Critical Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Priority to PL13756700T priority Critical patent/PL2864522T3/pl
Publication of EP2864522A2 publication Critical patent/EP2864522A2/fr
Application granted granted Critical
Publication of EP2864522B1 publication Critical patent/EP2864522B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/1208—Oxides, e.g. ceramics
    • C23C18/1216—Metal oxides
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1295—Process of deposition of the inorganic material with after-treatment of the deposited inorganic material

Definitions

  • the present invention relates to a method for the treatment of metal surfaces.
  • hydrophobicity of a surface depends by the appropriate combination between the structural characteristics, in terms of size of the roughness, and the energy of the same surface, in turn linked to the chemistry.
  • a surface is defined hydrophobic when the contact angle ( ⁇ ) that the same form with a drop of water is greater than 90°, hydrophobicity is said gradually increasing as the contact angle ⁇ goes beyond this threshold.
  • the super hydrophobicity is achieved when the contact angle of the surface with a drop of water is greater than 150°.
  • the higher the contact angle that the surface forms with a drop of oil the higher is the degree of oleophobicity.
  • the dynamic hydrophobicity is related to the ability of a drop of water to "roll” or “slide” along a surface, and then leave the same once the angle of inclination starts to increase.
  • the dynamic hydrophobicity can be expressed in two ways, by means of the minimum value of the angle of inclination that the surface must present in order to cause the "rolling" or the “sliding” of a drop of known size, or by means of the measurement of the hysteresis value (difference) between the contact angle with which a drop of known volume advances ( ⁇ ⁇ ) on an inclined plane and the angle of recession ($R).
  • the pertinent literature shows how the relationship between static hydrophobicity and dynamic hydrophobicity is complex and, in many cases, even if the static contact angle is sufficiently high (> 150°), it does not correspond to a sufficient dynamic hydrophobicity. This is because if the interaction of the droplet with the surface depends in a more or less direct manner from the surface roughness and energy, its movement on the same is affected by additional parameters, such as physical inhomogeneity, differences in chemistry and composition, particle size, etc., the influence of which is difficult to interpret.
  • oleophobicity Another functional property of great interest for the metal surfaces is oleophobicity, ie the repellency against oils, fats, etc.
  • the provision of this additional property to a metal surface allows to physically prevent the adhesion of dirt and grease particles, in order to further implement the performance of "self-cleaning".
  • the degree of oleophobicity of a surface depends strongly on the energy of the surface itself, or better, on the difference between the surface tension of the oily substance and the energy of the surface itself; the lower will be the latter, the greater the repellency of the surface towards adhesion of substances with higher surface tension.
  • Purpose of the present invention is to provide metal surfaces presenting a high hydrophobicity and oleophobicity without compromising their realization on an industrial scale.
  • Object of the present invention is a method for the treatment of metal surfaces, characterised in that it comprises in succession: - a step of depositing a coating of metal oxide, wherein on a metal surface is deposited a sol made from a colloidal suspension in water of one or more metal alkoxides M(OR) n in the presence of an acid catalyst, in which:
  • M is comprised in the group consisting of Al, Ti, Si, Y, Zn, Zr;
  • R is a linear or branched Ci-C 4 aliphatic chain
  • step of consolidation in which said coating is subjected to a temperature comprised between 150 °C and 400 °C;
  • step of superficial chemical activation in which said coating is treated with an alkylsilane compound.
  • said alkylsilane compound is fluorinated.
  • the method includes a third step of consolidation, in which, after being treated with an alkylsilane compound, the said coating is subjected to a temperature comprised between 50 °C and 300 °C.
  • the step of deposition provides that said sol is deposited by dipcoating or spray coating or spin-coating.
  • said coating has a thickness comprised between 50 and 500nm.
  • said coating is treated with a fluorinated compound by dipcoating or spray coating or spin-coating.
  • said fluorinated compound is a fluorine alkyl silane.
  • a further object of the present invention is a metal component having a surface coating made by the method forming object of the present invention.
  • the metal surface used is aluminum
  • the ceramic surface used is porcelain stoneware and the glass surface is a sodium- calcium glass (Superfrost-Carlo Erba), all suitably degreased and pre- treated.
  • a colloidal suspension of alumina was prepared by peptization of aluminum tri-sec butoxide 0.5M in aqueous solution in the presence of nitric acid as the acid catalyst. The reactions of hydrolysis and condensation which lead to the formation of the sol occur keeping the system under stirring at 80 °C.
  • the surfaces takeb ubder examination (metal, ceramic and glass) were subjected to an operation of "dip coating” in the sol at room temperature.
  • the operation of "dip coating” was realized with a speed of immersion and emersion of 120 mm/min and a soak time in the sol of 5 seconds. Once every single substrate has emerged from the sol, the solvent water is evaporated promoting the transition to the state of gel formed by nano particles of partially hydrolyzed AI2O3.
  • the substrates were heat treated in an oven at 400 °C for 10 minutes in order to remove organic residues and promote the densification of the formed coating.
  • the substrate is preferably cleaned and activated, for example by means of acid/basic attacks of the surfaces, heat treatment in air, machining or other.
  • the treated surfaces were immersed in boiling water for 30 minutes and again thermally treated in an oven at 400 °C for 10 minutes.
  • part of metal surfaces have been treated with a steam jet for a time of 30 min to be subsequently heat treated in an oven at 400 °C for 10 minutes as described above.
  • the treated surfaces were subjected to a further operation of "dip coating" in a solution containing an alkylsilane compound.
  • the compound used is a fluorine alkyl silane marketed by the company EVONIK with the code F8263.
  • the treated surfaces were kept in a stove at 150 °C for 15 minutes in order to promote the chemical activation of the surface of the film of alumina.
  • the abrasion was carried out by simulating the standardized operating procedure in the case of coated glass for buildings (UNI EN 1096-2, Appendix E: Test of resistance to abrasion).
  • UNI EN 1096-2 Appendix E: Test of resistance to abrasion.
  • an abrasive felt rotating pad (thickness 10 mm ⁇ 1 mm) with a diameter of 5,0 cm ⁇ 0,5 cm and operated at a speed of 30 rounds/minute.
  • the felt pad was applied to the treated surfaces with a force equal to 4N and for a time equal to 30 seconds.
  • Table I shows the measured values of the above characteristics.
  • the values of dynamic hydrophobicity which can be found on metal surfaces treated with the method of the present invention are such as to ensure high repulsion to dirt and contaminants of various kinds, also of biological origin, avoid in adverse environmental conditions the formation of ice and frost, effectively limiting phenomena of wear and corrosion, reduce, or even avoid, phenomena of fouling due to different agents, allow more favorable fluid dynamic conditions in the vicinity of the surface, with consequent gains in terms of energy.
  • the surfaces indicated as SM1 and SM2 were tested for freezing/unfreezing according to UNI EN 539-2 (2006).
  • the surfaces SM1 and SM2 have been subjected to successive cycles of freezing/unfreezing in a climatic chamber in which continuous thermal excursions from +1 1 °C to -17 °C occurs and in which the step of unfreezing occurs by means of immersion in water and the subsequent phase of freezing occurs after the water has been drained from inside the climatic chamber.
  • the number of cycles of freezing/unfreezing to which the surfaces SM1 and SM2 were subjected was equal to: 36, 119, 234, 345, 447.
  • the evaluation of the resistance to cycles of freezing/unfreezing is based on the measures of static hydrophobicity (static contact angle) and dynamic hydrophobicity (hysteresis) after each of the said cycles of freezing/unfreezing.
  • static hydrophobicity static contact angle
  • hysteresis dynamic hydrophobicity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
  • Ceramic Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Chemically Coating (AREA)
  • Surface Treatment Of Glass (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

La présente invention concerne un procédé pour le traitement de surfaces métalliques comprenant successivement : ‑ une étape de dépôt d'un revêtement d'oxyde de métal, dans laquelle, sur une surface métallique, un sol est déposé constitué d'une suspension colloïdale dans de l'eau d'un ou plusieurs alcoxydes de métal M(OR)n en présence d'un catalyseur acide, dans lequel : M est compris dans le groupe constitué de Al, Ti, Si, Y, Zn, Zr ; R est une chaîne aliphatique linéaire ou ramifiée en C1-C4 ; ‑ une étape de consolidation, dans laquelle le revêtement est soumis à une température comprise entre 150 °C et 900 °C ; ‑ une étape de fonctionnalisation, dans laquelle le revêtement est traité avec de l'eau bouillante et/ou de la vapeur pour la formation de groupes hydroxyle ; ‑ une deuxième étape de consolidation, dans laquelle le revêtement est exposé à une température comprise entre 150 °C et 900 °C, et ‑ une étape de fluoration, dans laquelle le revêtement est traité avec un composé fluoré.
EP13756700.4A 2012-06-21 2013-06-21 Procédé pour le traitement de surfaces métalliques pour conférer à celles-ci une hydrophobicité et une oléophobicité élevées Not-in-force EP2864522B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13756700T PL2864522T3 (pl) 2012-06-21 2013-06-21 Sposób obróbki powierzchni metalowych dla nadania im dużej hydrofobowości i oleofobowości

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000291A ITRM20120291A1 (it) 2012-06-21 2012-06-21 Metodo per il trattamento di superfici metalliche per conferire alle stesse una elevata idrofobicita' ed oleofobicita'
PCT/IT2013/000175 WO2013190587A2 (fr) 2012-06-21 2013-06-21 Procédé pour le traitement de surfaces métalliques pour conférer à celles-ci une hydrophobicité et une oléophobicité élevées

Publications (2)

Publication Number Publication Date
EP2864522A2 true EP2864522A2 (fr) 2015-04-29
EP2864522B1 EP2864522B1 (fr) 2016-09-07

Family

ID=46584172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13756700.4A Not-in-force EP2864522B1 (fr) 2012-06-21 2013-06-21 Procédé pour le traitement de surfaces métalliques pour conférer à celles-ci une hydrophobicité et une oléophobicité élevées

Country Status (5)

Country Link
EP (1) EP2864522B1 (fr)
ES (1) ES2605999T3 (fr)
IT (1) ITRM20120291A1 (fr)
PL (1) PL2864522T3 (fr)
WO (1) WO2013190587A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3670740B1 (fr) 2018-12-20 2022-02-02 European Central Bank Matériaux cellulosiques amphiphobes, leur production et leurs utilisations

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001287971A (ja) * 2000-03-31 2001-10-16 Matsushita Electric Ind Co Ltd 防汚性被膜及びその製造方法、それを用いた自動車用防汚ガラス及びその製造方法、並びにそれを用いた自動車
DE102004001097B4 (de) * 2004-01-05 2014-06-05 Epg (Engineered Nanoproducts Germany) Ag Metallische Substrate mit verformbarer glasartiger Beschichtung
WO2008083310A1 (fr) * 2006-12-29 2008-07-10 3M Innovative Properties Company Procédé de durcissement de films contenant un alcoxyde métallique
DE102007007526A1 (de) * 2007-02-15 2008-08-21 Epg (Engineered Nanoproducts Germany) Ag Feinste Interferenzpigmente enthaltende Glasschichten auf Metall-, Glas- und Keramikoberflächen und Verfahren zu deren Hersstellung
DE102007029668A1 (de) * 2007-06-27 2009-01-08 Epg (Engineered Nanoproducts Germany) Ag Ultraharte Kompositschichten auf Metalloberflächen und Verfahren zu ihrer Herstellung
DE102010011185A1 (de) * 2010-03-12 2011-09-15 Epg (Engineered Nanoproducts Germany) Ag Metallische Oberflächen mit dünner, glas- oder keramikartiger Schutzschicht mit hoher chemischer Beständigkeit und verbesserten Antihaft-Eigenschaften

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013190587A2 *

Also Published As

Publication number Publication date
ES2605999T3 (es) 2017-03-17
WO2013190587A2 (fr) 2013-12-27
WO2013190587A3 (fr) 2014-03-13
PL2864522T3 (pl) 2017-06-30
ITRM20120291A1 (it) 2013-12-22
EP2864522B1 (fr) 2016-09-07

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