A Breakthrough in Metal Corrosion Protection Technology

Transcription

1 A Breakthrough in Metal Corrosion Protection Technology

2 Evonik: A Partner of Choice Evonik Degussa Corporation is a modern industrial group with a leading position in many of today s growth markets. Thanks to a constant flow of new ideas, we are the architects of innovative products and solutions tailored to our customers needs. We focus on select markets in which we can draw on our expertise as we pioneer future areas of interest critical to the business success of our customers. We combine creativity and specialization with the reliability that makes us a partner of choice. We manage our company according to clearcut methods of state-of-the-art management with a focus on long-lasting value creation and sustained profitable growth. Products for coatings are a tradition at Evonik Degussa making us one of the largest and most experienced chemical suppliers to the worldwide coatings industry. Our Customers are Global, Just Like Dynasylan Like many of our customers, we operate worldwide. For more than half a century we have had a presence in major economic regions all over the world. But good products alone aren t enough; service oriented to customers' needs is an essential part of the package. For this reason we have continually brought our logistics (supply chain) into line with customers supply requirements. Our experience and expertise have been proven over decades. Dynasylan Technology - Experience, Knowledge, Future For more than 50 years, the brand Dynasylan has been a key component of the coatings industry and is now the leading brand of functional silanes. Thanks to Evonik Degussa s own research and technical expertise worldwide, the company owns some of most unique technologies throughout the world. Dynasylan metal corrosion protection technology provides the greatest flexibility for use as a primer or a protective coating for: Electroplating Galvanizing Coil and Sheet Coatings Powder Coatings Automotive Supplies Finished Sealers Steel Furniture Appliances Aerospace Fasteners Construction Together with Stucortec, a Swiss company active in professional corrosion protection, Evonik is already present in building constructions with the first applications of its new SIVO SOL technology. The Picasso Center was completed in Basel in 2006 and designed by the Zurich architect Peter Märkli. The imposing facade consists of vertically structured steel and glass components. Photo courtesy of Stucortec AG

3 A Breakthrough in Metal Corrosion Protection: Dynasylan HYDROSIL and SIVO SOL Technology Established surface pretreatment processes mainly chromatization and phosphatization are of utmost economical significance. The drawback of these otherwise very effective methods, however, is the poor environmental compatibility, since they work with aggressive media. Processing techniques involving substances containing Chromium (VI) are especially problematic. Because of new legal provisions such as the RoHS requirement (Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment), the use of chromatization processes with Chromium (VI) is no longer approved in many industries. Evonik Degussa Corporation s solvent-free, water-based Dynasylan technology has produced two innovative systems for metal protection, HYDROSIL and SIVO SOL technology, that save time and money while ensuring the protection of the environment. Silanes as Primers and Sol-Gel Coatings Silane Primer: <0. 1µ Sol-gel Coating: µ Normal Organic Pretreatment: 5-50 µ Metal Substrate, e.g. Al, Zn, Steel Silanes based sol-gel coatings: Same performance at reduced coating thicknesses. Comparison of Metal Treatment Processes for e.g. Al, Zn, or Steel Evonik Silane Based Process Alkaline Clean / Rinse / DI Rinse / Air Drying / Silane Application / Air Drying / Dry Off Oven / Paint Typical Chromate Process Mild Alkaline Clean / Rinse / Etch / Rinse / Rinse / Deoxidizer / Rinse / Rinse / Chromate / Rinse / DI Rinse / Dry Off Oven / Paint Typical Phosphate Process Alkaline Clean / Rinse / DI Rinse / Phosphate Conditioner* / Phosphate / Rinse / Rinse / Chrome Final Seal* / DI Rinse / Dry Off Oven / Paint * Not used all the time

4 SIVO SOL Technology A Flexible, Modular System for Metal Protection This nearly VOC-free sol-gel system has a long shelf life that forms the base component of the SIVO SOL technology. This base component, called Dynasylan SIVO 110, includes a stable aqueous dispersion of fine, non-agglomerated, nanoscale inorganic particles that are encapsulated by hydrolyzed and condensed organofunctional silanes. SIVO SOL technology is designed for thermally cured coating systems, e.g. powder coatings, which are cured at temperatures of approximately 200 C/400 F. The result is a completely new inorganic binder that requires tailor-made additives compatible with this new binder system. Because such additives were not available on the market, the Evonik team had to develop their own. The SIVO SOL technology is the first modular system that can be used to formulate coatings based on the requirements of the user. Currently, the modular system comprises the base component and two different additives. While the base component, Dynasylan SIVO 110, can be used by itself, other additives can be added either separately or in combination, depending on the properties required. One of the additives, Dynasylan SIVO 111, is a neutralizing agent for use on steel. Dynasylan SIVO 113 is a hydrophobizing additive that can be used to significantly increase weatherability. For the first time, this technological platform allows coating formulators to use inorganic coatings on a tailor-made basis. No Primer Sandblasted Steel SIVO SOL Primer Sandblasted Steel Sandblasted steel on the top left and right, galvanized steel on the left. Top coat-polyester powder coating approximately 60 µm. Pictures after 500 hours salt spray test. Galvanized Steel Dynasylan HYDROSIL Cost-Effective Metal Pre-Treatment SEM micrograph of a cured Dynasylan SIVO 110 coating on an AI substrate the fracture edge showing the coating thickness. Dynasylan HYDROSILs are hydrolyzed multifunctional silane oligomers in water. The products provide barrier protection as well as adhesion promotion to the topcoats. The combination with the appropriate coating acts as an effective metal protection system against corrosion. The corrosion protection properties are equal or better than with traditional pre-treatment systems, e.g. iron or zinc phosphate and chromate. Results according to ASTM B117 are shown in the chart on the opposite page. HYDROSIL can be applied directly on cleaned bare metal surfaces. The application of HYDROSIL doesn't require as many steps as traditional pre-treatments, which improves the efficiency of the process and leads to significant cost savings. The thickness of a HYDROSIL layer (1 µm or less) is considerably thinner than with traditional pre-treatment systems. SEM micrograph of a cured Dynasylan SIVO 110 coating on an AI substrate (after 0 2 plasma etching) showing the homogeneous distribution of Si0 2 particles.

5 Aluminum and steel metal panels are continuously examined after salt spray testing and compared over a period of hours for any corrosive deterioration or defects in to the metal surface. Dynasylan HYDROSIL and SIVO SOL pre-treated metal panels undergo stringent testing procedures for durability and flexibility through a series of experiments with no resulting cracks, breaks or deterioration of the paint or metal surfaces. Corrosion Test ASTM B117 on Pre-treated ALU 6061 Comparison of Standard Pre-Treatments against Dynasylan HYDROSIL Pre-Treatments Standard Pre-Treatments 10 Dynasylan HYDROSIL Cured at 60 C (140 F) 10 Dynasylan HYDROSIL Cured at 200 C (392 F) 10 RATING (0-10) of Failure at Scribe (Procedure A) (ASTM D Procedure A) BARE ALUMINUM Chromate Iron Phosphate + Chrome Seal Zinc Phosphate HYDROSIL % in DI water HYDROSIL % in DI water HYDROSIL % in DI water HYDROSIL % in DI water No. of hours Salt-Spray Primer thickness: approximately 1 µm Coating thickness: µm Type of coating: 2K Acrylic PU Dynasylan HYDROSIL and SIVO SOL Technology Offer the Following Attributes: Almost solvent free Odorless Superior adhesion Increased cost savings Reduced film thickness results in lower weight Chrome free formulation Water-borne UV light stable Abrasion, temperature and chemical resistance

6 Examples of Application Substrate Pre-treatment Coating Curing Advantage with Dynasylan Temperature ( C) Sand Blasted Steel SIVO SIVO 111 Powder Coating (polyester) 200 Improved durability and resistance. Hot Dip G alvanized Steel SIVO Acrylic Polyester Coating 200 Improved durability and better adhesion. Dispersion Al 6061 HYDROSIL % 2K PU Solvent Based 60 Equal to or better than Cr (VI) after in DI water 2000 h salt spray test. Electro Galvanized Steel HYDROSIL % 2K PU Solvent Based 60 Better corrosion protection than Zn in DI water phosphated steel. Improved adhesion. Cold Rolled Steel HYDROSIL % 2K PU Solvent Based 60 Better corrosion protection than Zn in DI water phosphated steel. Improved adhesion. Continuous testing of metal panels after exposure to salt spray. Dynasylan products can be dipped or spray painted. Ensuring Your Investment Today, there are a myriad of benefits from the use of Dynasylan. New areas of application are constantly being discovered by ongoing research and development in close cooperation with our customers. The newest chapter in Dynasylan technology is our innovative multifunctional silane systems. Whether you are thinking about an advanced Dynasylan product for a well-established application or have a new cutting-edge idea, Evonik Industries, broadest and most innovative range of organosilanes may offer just the right solution for you. Dynasylan Tomorrow s Solutions, Today All our efforts are aimed at maintaining and extending our technological leadership to improve the quality of products, thereby maintaining our strong competitive position in the global marketplace. Our objective is to develop ground-breaking technology. We focus on new technologies, applications and systems solutions for markets of the future. For more information on these and other solutions visit Solving customers problems instead of merely selling them chemicals is our approach to consolidate and expand our leading market position. Today Dynasylan products are used successfully throughout the world in metal pre-treatment, paints & coatings, adhesives & sealants, plastics, fillers & pigments and many more.

7 Dynasylan, helping protect your metal and the environment.

8 This information and all further technical advice are based on Evonik Degussa Corporation s present knowledge and experience. However, Evonik Degussa assumes no liability for providing such information and advice including the extent to which such information and advice may relate to existing third party intellectual property rights, especially patent rights. In particular, Evonik Degussa disclaims all conditions and warranties, whether express or implied, including the implied warranties of fitness for a particular purpose of merchantability. Evonik Degussa shall not be responsible for consequential, indirect or incidental damages (including loss of profits) of any kind. Evonik Degussa reserves the right to make any changes according to technological progress or further developments. It is the customer s responsibility and obligation to carefully inspect and test any incoming goods. Performance of the product(s) described herein should be verified by testing and carried out only by qualified experts. It is the sole responsibility of the customer to carry out and arrange for any such testing. Reference to trade names used by other companies is neither a recommendation, nor an endorsement of any product and does not imply that similar products could not be used. Evonik Degussa Corporation Inorganic Materials 379 Interpace Parkway P.O. Box 677 Parsippany, NJ USA PHONE (TOLL FREE) FAX dynasylan@evonik.com Evonik Degussa GmbH Inorganic Materials Weissfrauenstrasse 9 D Frankfurt am Main Germany PHONE FAX Evonik Degussa (China) Co., Ltd. Inorganic Materials 55, Chundong Road Xinzhuang Industry Park Shanghai P.R. China PHONE FAX EVAS-3002