Subject Passivation Based on Trivalent Chromium - SurTec
Subject Passivation Based on Trivalent Chromium - SurTec
Subject Passivation Based on Trivalent Chromium - SurTec
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<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> <str<strong>on</strong>g>Based</str<strong>on</strong>g> <strong>on</strong> <strong>Trivalent</strong> <strong>Chromium</strong><br />
Peter Volk, Dr. Karl Brunn • <strong>SurTec</strong> Deutschland GmbH • Zwingenberg
<strong>SurTec</strong> – Activities<br />
Cleaning Pickling<br />
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g><br />
Phosphating<br />
Corrosi<strong>on</strong><br />
Protecti<strong>on</strong><br />
Research, Development,<br />
Producti<strong>on</strong>,<br />
Sales, Services<br />
Coating<br />
Micro<br />
Technology<br />
Delacquering<br />
Aluminum<br />
Stainless<br />
Steel
<strong>SurTec</strong> in Germany<br />
Europe<br />
America<br />
� CST-<strong>SurTec</strong>, USA<br />
� <strong>SurTec</strong> Mexico, Mexico<br />
� Steel Quimica, Argentinia<br />
� Alianza, Chile<br />
� GMP, Columbia<br />
� <strong>SurTec</strong> do Brasil, Brasil<br />
� <strong>SurTec</strong> Eurosjaj, Bosnia and Herzegovina<br />
� <strong>SurTec</strong> SK, Slovakia<br />
� <strong>SurTec</strong> Adria, Slovenia<br />
Peter � <strong>SurTec</strong> Volk Deutschland, Germany<br />
� <strong>SurTec</strong> d.o.o., Croatia<br />
<strong>SurTec</strong> � <strong>SurTec</strong> Deutschland Ges.m.b.H., Austria GmbH � <strong>SurTec</strong> Scandinavia, Denmark<br />
� Glomax, Italy<br />
� Univar, Belgium<br />
Employed � Artegalva, Portugal<br />
� <strong>SurTec</strong> France, since France1998<br />
� <strong>SurTec</strong> Benelux, Netherlands<br />
� Univar, France<br />
Functi<strong>on</strong>: R&D and Product � <strong>SurTec</strong> Polska, Management<br />
Poland<br />
Africa<br />
� <strong>SurTec</strong> South Africa<br />
� TechnoPrest, Tunisia<br />
� <strong>SurTec</strong> Romania, Romania<br />
� <strong>SurTec</strong> Cacak, Serbia<br />
� <strong>SurTec</strong> CR, Czech Republic<br />
� Coquinesa, Spain<br />
� <strong>SurTec</strong> Schachen, Switzerland<br />
� DEDE, Turkey<br />
� alantechnologies, UK<br />
Asia<br />
� Morimura Bros., Japan<br />
� PAZ, Israel<br />
� <strong>SurTec</strong> Korea, South Korea<br />
� LC Système, UAE<br />
� Electrochemical , Thailand<br />
� YA THAI, Thailand<br />
� <strong>SurTec</strong> Chem. & Eng., PR China<br />
� <strong>SurTec</strong> Chemicals, India<br />
� <strong>SurTec</strong> Taipei, Taiwan<br />
� YST, PR China<br />
� MS Chem Enterprise, Malaysia<br />
� Ya Chung, Taiwan<br />
� PCC Ind<strong>on</strong>esia<br />
� Viet Naht, Vietnam
<str<strong>on</strong>g>Subject</str<strong>on</strong>g><br />
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> <str<strong>on</strong>g>Based</str<strong>on</strong>g> <strong>on</strong> <strong>Trivalent</strong> <strong>Chromium</strong><br />
� <strong>SurTec</strong> 650 chromitAL as Full Size Alternative for Hexavalent<br />
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g>s <strong>on</strong> Aluminium<br />
� Descripti<strong>on</strong> of the Process<br />
� Formati<strong>on</strong> of the <str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> Layer<br />
� Appearance of the Layer<br />
� Approvals and Applicators<br />
� C<strong>on</strong>clusi<strong>on</strong>
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> Process<br />
Cleaning<br />
mild alkaline<br />
pH 8-9<br />
50-60 °C<br />
1-15 min<br />
<strong>SurTec</strong> 133<br />
Etching<br />
highly alkaline<br />
50-60 °C<br />
1-5 min<br />
<strong>SurTec</strong> 181<br />
Desmutting<br />
str<strong>on</strong>gly acidic<br />
15-25 °C<br />
1-5 min<br />
<strong>SurTec</strong> 495<br />
Between each step, the surface must be rinsed.<br />
In case of laquering: C<strong>on</strong>ductivity of the last rinse
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> Process – Layer Formati<strong>on</strong><br />
Activati<strong>on</strong> of the surface:<br />
2 Al + 6 H 3 O + 2 Al 3+ + 6 H 2 O + 3 H 2<br />
The activati<strong>on</strong> is assisted by fluorides.<br />
Depositi<strong>on</strong> of the passivati<strong>on</strong> layer:<br />
x Cr 3+ + y Al 3+ + z OH - Cr x Al y (OH) z<br />
Aluminium<br />
<str<strong>on</strong>g>Passivati<strong>on</strong></str<strong>on</strong>g> Layer (<strong>SurTec</strong> 650)
Colour of chromitAL<br />
After passivati<strong>on</strong><br />
The layer is faintly blue-yellow. At a<br />
sharp angle the iridescence is visible.<br />
After salt spray test, 168 h<br />
The untreated surface is corroded,<br />
the chromitAL - layer is unchanged.
Approvals of <strong>SurTec</strong> 650 chromitAL<br />
MIL-DTL-81706B<br />
Type II - coating: Cr(VI)-free<br />
Approved for Class 1A:<br />
� 336 h NSS<br />
� Paint adhesi<strong>on</strong><br />
� Coating weight >107.5 mg/m²<br />
AND for Class 3:<br />
�
<strong>SurTec</strong> 650 chromitAL in Industry<br />
Aluminal Oberflächentechnik GmbH & Co. KG Franz Oberflächentechnik GmbH<br />
Friedrich Haug GmbH & Co. KG AOS GmbH<br />
Galvano Weis GmbH & Co. KG BINE GmbH<br />
Gerhard Heiche GmbH Blewa Metallverarbeitung GmbH<br />
GIATI Oberflächenveredelung BWB Flugzeuggalvanik Dresden GmbH<br />
GOT mbH Jena Harri Müller GmbH Eloxal<br />
Dekotec GmbH Heyer & Martin GmbH<br />
Dittes Oberflächentechnik GmbH HFJ Galvano Kiel GmbH<br />
Eloxal-München Heinitz GmbH Hohl GmbH<br />
Eloxalwerk Perltal Baum GmbH Holder Oberflächentechnik GmbH<br />
Rüge Galvanotechnik Karl Zitt GmbH & Co.<br />
S. Hoffmann GmbH Karmoli Oberflächentechnik<br />
LKM Lübecker Metallveredelung Spinner GmbH<br />
Südeloxal GmbH Süss Oberflächentechnik GmbH<br />
Münchner Galvanische Werkstätte Südbayrische Oberflächen GmbH<br />
Oberflächentechnik Neidhardt GmbH Rohde AG<br />
Vogel & Schworm GmbH Jösel Metallveredelung
C<strong>on</strong>clusi<strong>on</strong><br />
� <strong>SurTec</strong> 650 chromitAL is a Cr(VI)-free alternative for the yellow<br />
passivati<strong>on</strong>.<br />
� Equal properties (corrosi<strong>on</strong> protecti<strong>on</strong>, adhesi<strong>on</strong> of paints and c<strong>on</strong>tact<br />
resistance).<br />
� The trivalent passivati<strong>on</strong> is somewhat more heat resistant.<br />
� Same pretreatment before <strong>SurTec</strong> 650 as befor Cr(VI)-c<strong>on</strong>taining<br />
passivati<strong>on</strong>s.<br />
� Approved by QPL, Qualicoat and GSB.<br />
� <strong>SurTec</strong> 650 chromitAL is used by several companies and was<br />
adopted to intern normings.<br />
� In Germany, <strong>SurTec</strong> 650 is used in 50 producti<strong>on</strong> sites.
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