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Chemical Conversioncoating Surface Finishes
Chemical Transformation Film Services

Chemical conversion coatings are primarily applied to metals to improve their corrosion resistance and wear properties. These coatings also offer excellent adhesion for paints, making them an ideal base layer for organic coatings. Additionally, during cold processing, the conversion coating acts as a lubricant, reducing friction and wear, which enables the workpiece to endure higher loads.

Aluminum & Magnesiumchemical Transformation Film

The chemical conversion coating for aluminum and aluminum alloys (MIL-DTL-5541F) is formed through a process where the surface of the aluminum reacts with a chemical oxidizing agent in a conversion solution, creating a protective conversion film.

For magnesium and magnesium alloys, the chemical conversion coating (AMS-M-3171) is created through chemical or electrochemical treatment, forming an insoluble film that consists of oxide, chromium, phosphide, and other compounds. This coating not only protects the substrate and metal materials from corrosion but also enhances the adhesion of subsequent coating layers.

Type of Themical Transformation Film for CNC Machining Parts

  Aluminum and aluminum alloy chemical conversion coating (reference standard MIL-DTL-5541F)

TypesMaximum machining size (cm)HL Parts
Type IContains hexavalent chromium
Type IIFree of hexavalent chromium


ClassesDescriptionHL Parts
Classe 1AFor sprayed or unsprayed products requiring optimum corrosion resistance
Classe 3Used for antisepsis of products requiring low resistance

  Chemical transformation coating of magnesium and magnesium alloy (AMS-M-3171)

TypesDescriptionHL Parts
Type Ichromate treatment
Type IIdichromate treatment
Type IIIElectrochemical anodic oxidation treatment
Type IVChromic acid coating brush treatment
Type VFluorine anodic oxidation process with anti-corrosion treatment
Type VIChromic acid passivation treatment

HL Parts's Chemical Conversion Membrane Technology Capability

Substrate: aluminum and aluminum alloy, magnesium alloy

Reference Standard: MIL-DTL-5541F, AMS-M-3171

Test method: salt spray test, wet tape adhesion test, surface resistance test (for Class 3 coating only)

TypeAluminum alloy
dichromate treatment		Aluminum alloy environmental
protection passivation		Magnesium alloy
treated with dichromate		Magnesium alloy environmental
protection passivation
Maximum machining size60*50*100230*45*11040*20*4040*20*40
Maximum weight per piece40301010
ColorLight yellowOff-whiteGolden yellow, rainbowOff-white
EnvironmentNon environmental protectionenvironmental protectionNon environmental protectionenvironmental protection
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