Finishing Processes

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4D Metal Finishing offers a full array of coatings to meet your needs

Anodized Aluminum Type II

Anodize is a process done on aluminum. When aluminum is anodized naturally occurring oxidation is brought to the surface by submerging the part in an acid bath and applying a DC electrical charge to it. A DC positive charge is then applied to an aluminum anode also submerged in the same Acid bath. The pull from the positive charge then draws the molecules within the negatively charged part to the surface making the part much harder than normal aluminum. When this occurs the part becomes non-conductive, very porous. At this time the part can be dyed a variety of colors or left clear. The last step is to seal the parts to close the pores and avoid discoloration.

Colors available & Tank size

  • Black 96"x30"x48"
  • Clear 96"x30"x48"
  • Blue 96"x30"x48"
  • Red 96"x30"x48"
  • Gold 
  • Gray
  • Green 

Plating Specifications

  • MIL-8625-F TYPE II-CLASS 2 RoHS Compliant
  • Dual hoist line with 500 lbs capacity. Nickel Acetate or Hot DI water is used to seal parts. We are able to process other colors per customer Request. Masking is also available


Alodine is a process done on aluminum. It is a chemical film that is applied by process of immersion. This process allows for significant corrosion protection. Alodine is beneficial because while providing excellent corrosion protection, the part still remains conductive. Alodine also creates a bonding agent for paint to adhere to. Our chemical film can be applied in either a clear or gold color. Other common names for Alodine are chemical film, Irridite and chromate conversion.

  • Tank size: clear 72"x36"x48"
  • Tank size: gold 36"x36"x24"
  • Dual Hoist line with 500 lbs capacity. 

Alodine specifications available

  • MIL-C5541E-CLASS 3 or CLASS 1A
  • MIL-DTL-5541 CLASS 3 or ClASS 1A, Type I and Type II
  • Type II is ROHS Compliant

Chemical Cleaning & Bright Dip

Chemical cleaning is done to remove machining oils and to brighten up parts. Various options of chemical cleaning and bright dipping are available per customer request. Please call to discuss your needs. 


Passivate is a process that is done on stainless steel. Passivation is achieved when parts are properly cleaned to remove oils and dirt then dipped into a nitric acid or a citric acid solution to remove all foreign metals from the stainless steel part. This process is essential because it greatly reduces the likelihood of the stainless steel from corroding.

  • Tank Size: 96"x36"x48"
  • Special testing available
  • Citric and Nitric acid capabilities

Plating Specifications

  • ASTMA-967-13 
  • AMS-2700
  • QQ-3-35
  • ASTM-A-380

Zinc Type I, II, III, V,VI

Zinc plating is a process done on Steel, bronze, and copper. Zinc plating occurs when parts are submerged in a solution with a positive charge. A negative charge is then applied to a zinc anode. This causes zinc deposits to be pulled from the negatively charged anode to the passively charged parts surface. After the zinc transfer is complete, parts are coated with a chromate or passivate solution. This solution can be either a clear, blue, black or yellow. The Chromate or passivate increases the life expectancy of the part. Zinc plated parts allow solid corrosion protection, as well as a great coating for paint preparation.

  • Tank Size: 96"x29"x48"
  • Dual hoist line with 1,000lb Capacity
  • Barrel plating available 
  • Black (ROHS compiant)
  • Clear (ROHS compliant)
  • Blue (ROHS compliant) 
  • Baking available. Large capacity walk in oven


  • ASTM-B-633, Types I, II, III,V,VI

Other Services

  • Masking (liquid, tape, dye cuts) 
  • Plugging
  • Stripping
  • Baking
  • Testiing
  • Engineering