Specialty Coatings

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Zinc Phosphate Coating

Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc phosphates, to achieve corrosion resistance, lubrication, or as a foundation for subsequent coatings or painting. It is one of the most common types of conversion coating. The process is also called phosphate coating, phosphatization, phosphatizing, or phosphating.

At Riverdale, we offers medium grain weight Zinc Phosphate. Additionally, we offer Special Finishes over Zinc-Phosphate:
  • Zinc-Phosphate & Oil
  • Zinc-Phosphate & Oil, Spin Dry
  • Zinc-Phosphate & Wax
  • Zinc-Phosphate & Chrome Seal Only
  • Zinc-Phosphate & Heavy Wax
  • Calcium Modified Zinc-Phosphate
  • Iron Phosphate (Special)

Alkaline Zinc Nickle


Alkaline Zinc Nickle is an alloy composition of 12-15% nickel, with the remaining percentage made up of zinc. Following the addition of an acid coating during zinc nickel plating, this alloy has exceptional strength and corrosion resistance and can be easily passivated later on.

At Riverdale, we use the groundbreaking environmentally friendly Coventya Zinc/Nickel System (12-15% Ni). This is an extremely reliable process that provides for the direct plating on 410 Stainless Steel without the need for a “Flash Nickel Strike”, and also easily coats hard-to-plate Case Hardened parts.

This Zinc/Nickel plating system offers a bright, uniform finish, even in low current density areas, such as on clips, nails and stampings. Very even distribution of the plating deposit allows for long parts to be plated uniformly, unlike most other electroplating processes. With a 12 to 15% Nickel deposit, this system offers exceptional corrosion protection when used with passivates which are offered in clear or black.

Riverdale Plating and Heat Treat 


SPECIFICATIONS AND PROCESSES – March 2022 

Riverdale Plating and Heat Treat ISO 9001-2015 accredited by TUV, and is accredited to ISO 17025 by the American Association for Laboratory Accreditation (A2LA Accredited Certificate #3055.01). Please check here for certificate copies along with our scope of accreditation and the latest updates. 
The following is a listing of finishes that we are capable of producing as of the date shown above. Those finishes where formal approval has been received from an issuing authority are listed; others do not require formal approval; still others could be approved should a Tier One supplier make the request. Please contact us for any specs or finishes you do not see listed below, as we may be able to process them. 

(Listed Alphabetically) 
  • ASTM

    • B633 - Electrodeposited Zinc 
    • B 117 - Operation of Salt Spray Cabinet 
    • B 633 - Electrodeposited Zinc on Iron or Steel 
    • B 841 - Electrodeposited Zinc-Nickel Alloy 
    • B 850  - Relief of Hydrogen Embrittlement 
    • F 1137 - Phosphate & Oil (Grade 0 and 1 only) 
    • F 1941 - Electrodeposited Coatings 
  • DELPHI/ NEXTEER

    Contact us for information on individual approvals to these specifications 

    • 33001800 - Zinc Plating 
    • 33002583 - Zinc Alloy Plating 
    • DCM 5200 - Zinc Plate, Hexavalent Free Coatings 
    • DX 550100 -  Zinc Nickel Alloy 
    • DX 551200 series - Zinc Plate, Hexavalent Free 
    • DX 551300 series - Zinc Alloys Hexavalent Free 
    • DX 551330 - Zinc Nickel Alloy Black 
    • DX 551331 -  Zinc Nickel Alloy Clear 
  • GENERAL MOTORS

    We are capable of applying the following Standard Fastener Finishes. 

    • GMW 3044 - Zinc with Trivalent Chromates 
    • GMW 3179 - Zinc Phosphate Coatings (except code B, G) 
    • GMW 4205 - Zinc Nickel Alloy with Black Coating 
    • GMW 4700  - Zinc Nickel Alloy (Type B) 
    • GMW 16730 - Zinc Nickel Alloy with Black Coating 
    • GM 4435 - Protective Finish – Phosphate Type 
    • GM 6183 - Zinc Plating/Organic (Clear Only) 
  • CATERPILLAR

    • 1E0106 - Direct Hardening 
    • 1E0107 - Direct Hardening after Machining 
    • 1E0397 - Plating Zinc or Zinc Alloy 
    • 1E0475  - Coating-Heavy Zinc-Iron Phosphate 
    • 1E1675 - Coating –Fastener (A-F not G) 
    • 1E2257  - Bake – Hydrogen Embrittlement Relief 
    • 1E2402 - Oil-Corrosion Preventative 
  • HARLEY DAVIDSON

    • ES805-43250 - Zinc Plating for Exposed Surfaces (obsolete) 
    • ESPEC805-050 - Zinc Plating for Exterior Use 
    • ESPEC 805-055 Type I and II - Zinc Plating for Fasteners - Friction Modified 
    • ESPEC 805-060 G, B, BH - Zinc Nickel Alloy Plating  

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