Chemical Processes


What We Do


Passivation improves the corrosion resistance properties of stainless steel and titanium components by dissolving iron or other impurities that has been imbedded in the surface during forming or machining.

Hillock offers numerous passivation processes (nitric acid, nitric acid & chromic acid, citric acid) to ensure all customers parts can receive the passivation process. Extensive R&D has resulted in a robust process for the most difficult of alloys, such as 416 and 440C.

Our passivate line contains three ultrasonic cleaners and a closed loop deionized water rinse system to ensure defect free passivation. Effectiveness of passivation is verified in house with a Water Immersion Tester (24 hour test) or copper sulfate (OEM specified – immediate results).

Chemical Cleaning

  • Ultrasonic Alkaline Cleaning
  • Electrolytic Alkaline Cleaning
  • Nitric/Fluoride Pickling
  • Acid Descaling
  • Citric Acid cleaning
  • Wire EDM recast etching

Featured Finishes

  • Passivation processes compatible with 400 Series and free machining stainless steel alloys
  • Optimized cleaning cycles specific to each alloy and surface condition

Quality Service for Engineered Performance Coatings.

Hillock Anodizing, Inc. is committed to the continuous improvement of all products and services and is determined to remain the quality leader in Hillock Anodizing, Inc’s field of expertise. Commitment to the goals of continuous improvement, customer-driven service, product quality, and employee involvement is of the utmost importance.