Racking
Confirm part orientation, contact points, masking areas and loading density to reduce handling damage, trapped liquid and poor electrical contact.
MAGNESIUM CLEANING · PASSIVATION · E-COATING
Magnesium Surface Treatment
From Clean Metal to Controlled Protection
Dongguan Chuanya Metal Products Co., Ltd. provides subcontract magnesium alloy cleaning, chromium-free passivation, conversion coating, cathodic e-coating and combined protection for automotive and engineered components.
9-STAGE PROCESS
Magnesium cleaning and passivation process
A controlled sequence from oil removal and staged rinsing to surface purification, conversion coating and drying. Parameters are adjusted for alloy, casting condition, geometry and acceptance criteria.
Ultrasonic Degreasing
Ultrasonic cavitation and a controlled degreasing system remove machining oil, rust preventive oil and particulate contamination, including in cavities and blind holes.
Water Rinse
Remove displaced soils and residual cleaner to reduce chemical carryover and surface contamination.
Spray Rinse
Use targeted spray action to rinse external surfaces, holes and edges more consistently.
DI Water Rinse
Reduce ionic and mineral residues before purification and conversion coating.
Surface Purification
Condition or activate the magnesium surface according to alloy grade and incoming surface condition.
Conversion Coating
Form a controlled passivation film designed around corrosion resistance, adhesion and downstream coating requirements.
Final DI Water Rinse
Remove unreacted residues and control final-rinse cleanliness to reduce water marks, stains and corrosion risk.
Drying
Control temperature and time for the part geometry and coating system while avoiding trapped water, overheating and secondary contamination.
Bath chemistry, temperature, time, concentration and test frequency are project-specific and are confirmed through representative samples and the agreed quality plan.
TECHNICAL PAGES
Explore by process and application
Focused pages help sourcing and engineering teams understand our service scope, inputs and validation path.
TECHNICAL PAGE
Cleaning & Passivation
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TECHNICAL PAGEMagnesium Passivation
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TECHNICAL PAGEE-Coating
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TECHNICAL PAGEAutomotive Parts
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Project quality priorities
We confirm incoming conditions before defining the sample, pilot and production acceptance plan.
Incoming review
Alloy grade, casting condition, oil type, oxidation, burrs and machining residues.
Process control
Bath condition, rinse quality, rack contact, masking, drying and prevention of secondary contamination.
Delivery criteria
Appearance, coating integrity, adhesion, film build, corrosion and packing follow the agreed specification.
Frequently asked questions
What is the standard magnesium cleaning and passivation sequence?
Our nine-stage sequence is racking, ultrasonic degreasing, water rinse, spray rinse, DI water rinse, surface purification, conversion coating, final DI water rinse and drying. Parameters are validated for each alloy and part.
Can you start with samples before production?
Yes. New projects normally move from sample validation to a pilot lot before the production window is released.
Which magnesium parts can be reviewed?
We review die-cast automotive housings, brackets, consumer-electronics structures, robotics parts and other engineered magnesium components.
REQUEST AN ENGINEERING REVIEW
Send your part details and drawing
Please include the alloy grade, application, target process, estimated volume, appearance standard and corrosion requirements. For confidential drawings, contact us before transfer.
Phone / WeChat: +86 13724861913