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US Army Toxic Metal Reduction Program: Eliminating Cr(VI)

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US Army Toxic Metal Reduction Program: Eliminating Cr(VI) DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE U.S. Army Toxic Metal Reduction Program: Eliminating Cr(VI) and Cd in Army Surface Finishing For ASETSDefense 6 December 2016 Erik Hangeland Program Director, RDECOM Environmental Technology Acquisition Program DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE What is the TMR requirement? Process Specification Hazardous Chemicals Aluminum Conversion MIL-C-5541-E Coating MIL-DTL-81706B Sodium Dichromate Chromic Acid, Sodium MIL-A-8625F Type I Dichromate, Chromium Aluminum Anodize and IB Trioxide Cadmium Special, Cadmium Cadmium Brush Plate MIL-STD-865C Alkaline, Cadmium Acid Cadmium Oxide, Sodium SAE AMS-QQ-P- Cyanide, Cadmium, Nickel Cadmium Plating 416B Type II Chloride, Iridite Hard Chrome Plate SAE AMS-QQ-C-320 Chromic Acid Copper Cyanide, Sodium Copper Plating ASTM 2418F Cyanide, Sodium Dichromate Electroless Nickel AMS2404F Nickel Chloride Magnesium Anodize - AMS-M-3171 Type III, Chromic Acid, Sodium #2 P2TT priority Conversion Coating IV, VI Dichromate (2013) Nickel Chloride, Nickel Nickel Plating SAE AMS QQ-N-290 Sulfate, Nickel Sulfamate Passivate SAE AMS 2700B Sodium Dichromate MIL-DTL-16232G Chromium Trioxide, Chromic Phosphate TT-C-490, Type I Acid Potassium Cyanide, Silver Silver Plating ASTM B700-97 Cyanide DOD-P-15328 Wash Primer TT-C-490F Zinc chromate DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 2 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Metal Plating Projects Total Army Usage in Plating Total Cr(VI): 10,000 lbs/yr Total Cd: 1,270 lbs/yr Total CN: 80 lbs/yr Cadmium Plating Chrome Plating Other Metal Plating Cadmium Hard Chrome Cadmium Cadmium Chrome Plate Electro- Electro- Copper Silver Nickel Brush Plating Plate Sealing Stripping plating plating Surface Finishing Processes Nickel Important to Copper Copper Plate Silver Silver Plate Electroless Electro- the Army Plating Stripping Plating Stripping Nickel plating Cd Special, Copper and Nickel Cadmium, Sodium Chromic Chromic Chromic Silver Potassium Nickel Cd Acid, Sodium Chloride and Cd Oxide Dichromate Acid Acid Chemicals Acid Cyanide Cyanide Chloride Cd Alkaline Cyanide Sulfate Targeted for Replacement NLOS LOS Plating – LOS Plating – LOS Plating – Gun Barrel Electrical Fasteners Components Plating/High Steel/Ground Non-Ferrous Other Niche Inner Distinct Connectors Throughput Vehicles Substrates Applications Diameters Demonstrations Needed Corrosion Zinc-Nickel or Zinc-Nickel or Trivalent Trivalent Cold Spray Cold Spray TBD, Likely Cold Spray Aqueous No projects Resistant High Purity High Purity Chromium Chromium with Nickel with Nickel Cold Spray or with Solutions of planned Steels Aluminum Aluminum with Reverse Electroplating or Carbide- or Carbide- Warm Spray Tungsten- Potential Copper and Plating Plating Current Nickel- Nickel- Tantalum Alternative Silver Salts Process Chrome Chrome Powders Technologies Powders Powders DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 3 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Pretreatments and Finishes Total Army Usage in Pretreatments and Finishes Total Cr(VI): 140,000+ lbs/yr Pretreatments Finishes Wash Conversion Steel Phosphating Anodizing Sealing Priming Coating Passivating Surface Finishing Ion Vapor Spray Rubber Processes Magnesium Aluminum Anodize Hard Anodize Zinc Plate Black Oxide Deposition Aviation Important to Anodizing Anodizing Stripping Sealing Sealing Sealing the Army Alum. Sealing Sealant Sodium Sodium Various Zinc Chromic Sodium Chromic Sodium Sodium Sodium Chromic Sodium Dichromate, Dichromate, Chromate Chromate Acid Dichromate Chemicals Acid Dichromate Dichromate Dichromate Acid Dichromate Chromic Acid Chromic Acid Salts Targeted for Replacement Aluminum & Aluminum & Aircraft Parts Flyable Non- Chemical Ferrous Parts Ferrous Parts Spray and Aircraft Distinct Chemical Pretreatment Immersion Immersion Immersion Spray (1109th Demonstrations Pretreatment (LEAD) (ANAD) (CCAD) TASMG) Needed Manganese/ Laser Zirconium Manganese, Alkaline Tartaric Sodium Trivalent Trivalent Trivalent TBD, May Citric Acid Fluoride, Structuring Oxide Zirconium Fluoride- Sulfuric Acid Hydroxide, Chromium, Chromium Chromium Require Zirconium or or Inorganic Silicate Fluorides, Potential Zirconium or Reformulation Silane-based Fluoride- Solution Iron Salts Alternative Manganese/ Products based Nitric Acid, Technologies Fluoride Products Sulfuric Acid DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 4 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Advanced Surface Coating Plan - LEAD lbs Process Contains lbs Species Product 6+ Chromated Primers - Wash Primers Cr 6735 606 6+ Chromate Conversion Coatings - Tank Cr 2945 412 Cadmium Brush Plating Cd 476 119 6+ Specialty Coatings - CHOShield Cr 273 10 6+ Chromated Primers - Other Cr 63 9 6+ Chromate Sealer Cr 405 8 Chromate Conversion Coatings - Cr6+ 60 1.8 Touch-up Pens Specialty Coatings - Silk Screen Red Cd 0.58 0.01 Total All 10957 1166 Total Cd 477 119 Total Cr 10481 1047 Table 4. Process Cd and Cr6+ Usage (Noblis, 2016) Figure 2. Process Usage at LEAD (based on pounds of Cr6+ and Cd species) (Noblis, 2016). ETAP supports SERDP/ESTCP objective to reduce Cr(VI) and Cd use and emissions at DoD Depots by 90% in 5 years . Current TMR projects will eliminate 88% of total Cr(VI) and Cd at LEAD . FY18 cadmium brush plating project to eliminate another 10% . Where to go from here? . Collect high resolution data at remaining Army depots . Partner with ESTCP to fill remaining technology gaps Current TMR projects will eliminate 98% of Cr(VI) at LEAD DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 5 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE CCAD Plating Shop Cr(VI) Elimination CCAD Plating Shop Tanks Currently Containing Cr6+ Line Process Num Tanks % Tanks A Black Oxide Seal 1 3 B Manganese Phosphate 1 2 G Al Conversion Coat 3 8 H Copper Strip 2 5 L Stainless Steel Passivation 6 15 N-P Chrome Plating 11 28 Q Magnesium Conversion Coat 5 13 R Cadmium Sealer 3 8 T Chromic Acid Anodize 4 10 T Anodize Strip 2 5 T Hard Coat Anodize Seal 1 3 Total 39 100 CCAD Plating Shop Tanks Containing Cr6+ if Existing Projects are 100% Successful Line Process Num Tanks % Tanks A Black Oxide Seal 1 3 B Manganese Phosphate 1 2 G Al Conversion Coat 3 8 H Copper Strip 2 5 L Stainless Steel Passivation 6 15 N-P Chrome Plating 11 28 Q Magnesium Conversion Coat 5 13 R Cadmium Sealer 3 8 T Chromic Acid Anodize 4 10 T Anodize Strip 2 5 T Hard Coat Anodize Seal 1 3 Total 39 100 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 6 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Cr(VI)-Free Low VOC Alternatives for Spray-in- Place, Mixed Metal Pretreatments, TMR 12-01 . Objective: Eliminate Cr(VI) in multi-metal spray-on pretreatment applications (alternative to wash primer) . Magnitude of impact: .Reduce Cr(VI) by 24K lbs/year, volatile organic compounds (VOCs) by 2.4M lbs/year .Violation of VOC emission limits could restrict maintenance .Cancellation of DOD-P-15328 planned for September 2017 . Intended end product: Validated Cr(VI) spray applied chemical pretreatments for multi-metal applications per TT-C-490F . Technology: .Commercially available metal pretreatment technologies on multiple substrates and mixed metal assemblies added to QPD • Laboratory testing 1. Bonderite 7400 (phosphoric acid, hexaflourotitanic acid, Mn) FY12 2. Zircobond 4200 (zirconium immersion chemistry) 3. Oxsilan 9810/2 (organo-silane polymers) • Down-selection/Outdoor testing FY13 . Weapon systems impacted: All systems currently using DOD-P- 15328 chromated wash primer (ground vehicles, combat service • Demo at LEAD, implementation support equipment and aviation/missile systems) FY15 through TT-C-490 QPD . Transition Path: TT-C-490F Qualified Product Database . POC: Jack Kelley, ARL, [email protected] • Demo at ANAD .IPT: ARL, Letterkenny Army Depot (LEAD), Anniston Army Depot FY17 (ANAD), Red River Army Depot (RRAD), Henkel, PPG DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 7 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Cr(VI)-Free Conversion Coatings, TMR 14-02 . Objective: Eliminate Cr(VI) in conversion coatings (CC) . Magnitude of impact: .Eliminate 100K lbs/yr of Cr(VI) in Al CC, 6M pounds of CARC waste .Consolidated ferrous and non-ferrous pretreatment line . Intended end product: Multiple approved Cr(VI)-free CCs for aircraft and Ground Support Equipment (GSE) (multi-metal and composites), application by spray and immersion . Technology: Assess commercially available Al pretreatments .Aviation: CCAD, TASMG, Corrosion Repair Facility . Spray/immersion: Henkel Bonderite MN-T-5700, PPG Industries 11-TGL-27 • Select candidates .GSE (immersion): ANAD, LEAD, Tobyhanna Army Depot FY14 • Laboratory testing . PPG X-Bond 4000 (Zr), Henkel Bonderite MN-T-5200 • Downselect products .Leverage: ESTCP (LEAD) and USMC - Albany demos FY15 . Weapon systems impacted: All tactical equipment that • Demo at CCAD (spray) requires CARC FY16 • Demo at CCAD, ANAD (immersion) . TT-C-490, MIL-DTL-53072, MIL-DTL-5541, Transition Path: • Demo at TASMG (spray) MIL-DTL-81706 FY17 • Observe demo on end items . POC: Fred Lafferman, ARL, [email protected] • Implementation .I PT: AMCOM, AMRDEC, AED, TACOM, LEAD, RRAD, FY19 CCAD, TASMG, PPG Ind., Henkel DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE 8 DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE Cr(VI)-Free Aluminum Anodizing, TMR 15-01 . Objective: Eliminate Cr(VI) in aluminum anodizing, stripping and sealing . Magnitude of impact: .CCAD anodize and anodize stripping baths use: . Anodize: 2300 gallon tank with 1500 lbs. chromic acid, added as
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