WP
Wet paint systems
Primer and topcoat combinations for broad color choice, large parts, field repair, and specified corrosion performance.
Surface Finishing
Surface finishing and heat treatment, matched to corrosion, wear, and appearance.
JK Casting reviews surface finishing and heat treatment for the castings we supply, based on their service environment. Send drawings, 3D files, samples, or worn parts; we check substrate, corrosion, wear, masking, thickness, color, texture, inspection, and packing before coating or heat treatment.
Drawing-based reviewLow-to-mid volumeExport support
Capability pageClear technical scope, practical production route, and RFQ-ready evidence.
Service environment
Finishing decisions start with exposure—not color alone.Outdoor · marine · chemical · abrasion · UV · handling damageWet paintFlexible color systems
Powder coatingDurable decorative finish
Zinc protectionGalvanizing & plating
Conversion coatingsPhosphate & black oxide
Finish families
Finish options for the castings we supply.
The finish depends on substrate, geometry, corrosion target, masking, appearance, and cost. For power line hardware or oilfield components, send the service conditions and coating specification. Agree the processing provider and inspection records before production.
PC
Powder coating
A durable, consistent decorative coating for compatible part size, geometry, masking, and cure conditions.
ZG
Hot-dip galvanizing
Thick sacrificial zinc protection for outdoor steelwork where drainage, venting, appearance, and dimensional change are acceptable.
ZP
Zinc plating
Controlled zinc protection for smaller steel parts, fasteners, and hardware with specified passivation and thickness.
PH
Phosphate / black oxide
Conversion finishes used for appearance, oil retention, paint preparation, or moderate corrosion control.
SP
Shot blasting & preparation
Surface cleaning and profile preparation that strongly influence coating adhesion and final appearance.
Heat treatment
Heat treatment for castings.
Finishing and heat treatment are quoted together with the castings we supply and are arranged to the agreed specification. State the required condition, hardness range and test method on the drawing or in the RFQ.
NQ
Normalizing or quench and temper
For carbon steel castings that must reach the hardness or mechanical properties on the drawing.
SR
Annealing or stress relief
Before machining, where dimensional stability of the finished part matters.
HR
Hardness records
Hardness results after treatment, recorded when the order requires them.
By application
What to specify for each application.
Name the finish your drawing or customer specification requires, and the details below that affect coating, masking and fit.
Power line hardware
Coating standard and thickness; allowance on threads and pin holes.
Oilfield parts
Coating type; masking of bores and clamp faces.
Agricultural machinery
Color reference; primer and topcoat system.
Construction equipment
Color; masking of machined fits.
Industrial machinery
Masking of bearing seats and sealing faces; protection of machined faces in transit.
Technical evidence before production
Specification inputs
Define what must be protected—and what must remain bare.
Coating problems often come from missing details at interfaces: threads, bearing seats, electrical contacts, sealing faces, weld zones, and drainage paths.
✓Substrate and pretreatment sequence
✓Coating type, color, gloss, and texture
✓Dry film or plating thickness
✓Masked threads, bores, datums, and sealing faces
✓Salt-spray, adhesion, impact, or appearance criteria
✓Touch-up, preservation, labeling, and packing requirements
Practical workflow
A repeatable finishing workflow from preparation to final inspection.
1
Clean & prepare
Remove scale, oil, rust, and contamination; create the required surface profile.
2
Mask critical areas
Protect machined fits, threads, grounding points, and other no-coat zones.
3
Apply & cure
Control material, application, film build, cure conditions, and handling.
4
Inspect & protect
Check appearance, thickness, adhesion, masking, damage, and packing protection.
Deliverables & controls
Finish requirements that can be inspected objectively.
Document the technical basis so purchasing, production, inspection, and shipment use the same requirements.
Reference system or specification
Name the approved coating system, standard, supplier system, or customer specification.
Measurable acceptance criteria
Define thickness, color tolerance, gloss, adhesion, corrosion test, or visual standard as needed.
Masking drawing
Show protected threads, bores, fits, contacts, and datum areas clearly.
Approved sample or color standard
Use a physical chip or approved sample when appearance is commercially important.
Frequently asked questions
Questions buyers ask before release.
Final acceptance criteria follow the approved drawing and purchase order.
Can you match a specific paint color?
Yes, when a recognized color reference or approved sample is provided. Color and gloss tolerances should be agreed before production.
Should machined surfaces be coated?
Functional fits, bearing seats, sealing faces, threads, and grounding points are often masked or preserved differently. The drawing should identify them.
Can you provide corrosion-test reports?
Where required, the test method, duration, sample preparation, acceptance criteria, and reporting scope should be defined in the RFQ.
How do you prevent finish damage in shipping?
Packing can include separators, protective films, caps, VCI materials, custom crates, and handling instructions according to part geometry and finish risk.
Can galvanized parts keep thread and fit tolerances?
Hot-dip galvanizing adds zinc thickness, so threads, pin holes and fits need an allowance or masking agreed before production. Mark these features on the drawing.
Ready for review
Send your part requirements for a practical quotation path.
Share drawings, models, samples, quantities, material requirements, finish, inspection scope, and target delivery. We will review the evidence and identify the next technical step.