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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.

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henkel rohs compliant passivate discussion
Henkel – RoHS CompliantPassivate Discussion
  • Agenda:
    • Position on RoHS
    • Products Discussion
      • Offerings
      • Corrosion performance
      • Field experience
    • References
henkel position on rohs
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.
hexavalent chrome free passivation offerings
Hexavalent Chrome-Free Passivation Offerings
  • Three approaches:
    • Non-chrome containing inorganic passivate
    • Trivalent chrome inorganic passivate
    • Thin organic coating non-chrome containing (acrylic coatings)
hexavalent chromium containing inorganic passivates chemtreats
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”
henkel passerite 5004 w chromium free inorganic passivate
Henkel Passerite 5004 WChromium-Free Inorganic Passivate

Major Coating Constituents

  • Molybdenum
  • Titanium
  • Phosphate
  • Fluoride
  • Organic Polymer
slide7

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
passerite 6001 passerite 6003 bonderite 6020 trivalent chromium passivate application parameters
Passerite 6001 / Passerite 6003 / Bonderite 6020Trivalent Chromium Passivate Application Parameters
recommendations for designing a system for hex chrome free passivates
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
henkel standard accelerated corrosion tests for passivation treatments
Henkel Standard Accelerated Corrosion Tests for Passivation Treatments
  • Neutral Salt Spray (NSS)
  • Wet Stack
  • Cleveland Condensing (CCH)
  • Butler Water Immersion (BWI)
trivalent based passivation product evolution commentary
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
slide13

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

slide15

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
granocoat 342 non chrome acrylic
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)