1 / 26

Workshop on Hazardous Substances Affecting Metallic-Coated Steel and Other Metals

Workshop on Hazardous Substances Affecting Metallic-Coated Steel and Other Metals. May 23, 2007. Henkel – RoHS Compliant Passivate Discussion . Agenda: Position on RoHS Products Discussion Offerings Corrosion performance Field experience References. Henkel Position on RoHS.

johana
Download Presentation

Workshop on Hazardous Substances Affecting Metallic-Coated Steel and Other Metals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Workshop on Hazardous Substances Affecting Metallic-Coated Steel and Other Metals May 23, 2007

  2. Henkel – RoHS CompliantPassivate Discussion • Agenda: • Position on RoHS • Products Discussion • Offerings • Corrosion performance • Field experience • References

  3. Henkel Position on RoHS • Electrical and electronic equipment (not all end users) • Appliances • Computers • Televisions, video recorders • Hexavalent Chromium (CrVI) is critical element for metal passivation treatments listed in RoHS regulation • Must contain less than (0.1%) 1000 ppm. Hexavalent chromium or contain no intentionally added hexavalent chromium in any homogeneous layer • Henkel position is that passivate coatings do not become a homogeneous layer with substrate, but, the discontinuous layer of the passivate. (IBM agrees with this position). • Chromium free products are compliant simply because there is no chrome present • Chromium III (trivalent) products are compliant in both the product and as-dried surface since Cr(VI) is below 1000 ppm and no Cr(VI) is intentionally added. • Conversion of Cr(III) → Cr(VI) will not happen under “normal” circumstances • PH≥14 or extreme oxidation are required • Practical basis, Cr(VI) not present during life-cycle of the coated materials.

  4. Hexavalent Chrome-Free Passivation Offerings • Three approaches: • Non-chrome containing inorganic passivate • Trivalent chrome inorganic passivate • Thin organic coating non-chrome containing (acrylic coatings)

  5. Hexavalent Chromium Containing Inorganic Passivates: “Chemtreats” • Typical coating weight: 1.0 – 2.0 mg/sq.ft. Cr • Applied by flood squeegee and dried by hot air dryer • Corrosion performance by neutral salt spray (NSS): 96+ Hrs. • “Wet” corrosion tests: 800+ Hrs. • Low cost, good corrosion prevention • “Non-Paintable”

  6. Henkel Passerite 5004 WChromium-Free Inorganic Passivate Major Coating Constituents • Molybdenum • Titanium • Phosphate • Fluoride • Organic Polymer

  7. P-5004 W Chrome-Free Inorganic Passivate • Application • Bath Concentration 20%-100% (Dependent On Coater) 30% is Typical • Run as Flood or Dip/Squeegee or Chemcoater • Bath pH: 2.5-3.5 • Coating Wts.: 30-80 mg./sq.ft. (50 mg. is recommended) • Bath Temperature: <40C (104°F) • Strip PMT: 50-60C min., 120C max. (Above 120°F) • Drying Time: < 10 seconds recommended

  8. Passerite 6001 / Passerite 6003 / Bonderite 6020Trivalent Chromium Passivate Application Parameters

  9. Recommendations for Designing a System for Hex-Chrome Free Passivates • Solution contact time (time between application / drying ) – as short as possible. Less than 5 seconds excellent. • Chemcoater best method (spray / squeegee is acceptable) • Drying peak metal temp (PMT) - 120°F minimum (220°F max) • Equipment materials (contacts solution) – 316 or 304 stainless steel, or polymer (PVC, PEHD or PP) – no carbon steel • Wringer rolls – Hypalon, Viton or polyurethane covering – 45 – 55 shore hardness • Solution volume – as small as possible – less than 30 gallons – (Henkel “Coiltech” system) • Maintain pH below 2.5 – minimize zinc contamination • X-Ray fluorescence (Portaspec) recommended for coating weights

  10. Henkel Standard Accelerated Corrosion Tests for Passivation Treatments • Neutral Salt Spray (NSS) • Wet Stack • Cleveland Condensing (CCH) • Butler Water Immersion (BWI)

  11. Corrosion Overview – Field Performance

  12. Trivalent Based Passivation – Product Evolution Commentary “Passerite 6001 → Passerite 6003 → Bonderite 6020” • Continuous improvement in all of the following: • Corrosion performance (NSS) • Lower coating weight (lower applied costs) • Improved “paintability” • Improved conductivity (IBM and HP) • Less corrosive to equipment (304 and 316SS) • Bonderite 6020 – removal of organics – no foaming • Products have become more operator and end-user friendly • Next generation product – Bonderite 6010 – “fluoride free” – being tested in Europe

  13. Thin Organic Non-Chrome Coating:(Replacement For Hexavalent Cr Containing Acrylics)Granocoat 342 • Primarily Used For Galvalume and HDG Coated Steel • Expected Performance: Roll forms without oil Good fingerprint resistance Excellent corrosion performance 180° – 220° F PMT

  14. Non-Chrome Thin Organic Coating: Granocoat 342 Specifications:

  15. Non-Cr Thin Organic Passivate: Application Parameters: • Coating Weight: 75-200 mg./sq.ft. • PMT: 170° - 250° F • Application Method: Chemcoater • Concentration: Used Neat • Application Temperature: Ambient • Recoil Temperature: <160°F

  16. Granocoat 342 (Non-Chrome Acrylic) Summary: • Corrosion performance slightly inferior in NSS (HDG) and wet stack (Galvalume) • Roll-forming excellent and verified at 9-stage roll former (correlates well with Butler Building roll former) • “Paintable” surface • In use at Precoat – Portage and CFM for small applications • Successful trials at Mittal – Sparrows Point (Galvalume) and Nucor – Berkeley (HDG)

  17. INORGANIC PASSIVATION HEX-CHROME FREEREFERENCES LIST CUSTOMERS

  18. Thank you

More Related