This case shows how Himgo supported a European automotive aftermarket brand in controlling electroplating color variation on zinc alloy 3D metal emblems used for front grille branding.
The final solution focused on chrome brightness control, matte black infill consistency, plating thickness stability, and batch-level color measurement. Color variation was controlled within ΔE < 1.5 across mass production.
Project Overview
| Industry | Automotive aftermarket |
| Location | Poland |
| Customer Type | European automotive aftermarket brand |
| Business Scope | Performance vehicle branding components |
| Application | Front grille metal emblem |
| Project Nature | Batch color inconsistency from previous supplier |
| Product | Zinc alloy 3D metal emblem |
| Size | 95 mm × 40 mm |
| Thickness | 3.0 mm |
| Relief Height | 1.5 mm |
| Surface Finish | Chrome plating + matte black infill |
| Total Lead Time | ~6 weeks |
Application Scenario
The emblem was installed on the front grille of performance vehicles. For automotive branding applications, the front grille position creates stronger visual exposure than rear or side body positions.
- Outdoor exposure throughout the year
- UV exposure under changing seasonal conditions
- High airflow at the front grille position
- Dust and road particle impact during driving
- Temperature variation from -25°C to 60°C
Customer Problem
The customer contacted Himgo after repeated complaints related to visible appearance variation. The previous supplier could produce acceptable samples, but mass production batches were not visually consistent.
- Visible color difference between batches
- Chrome brightness variation under daylight
- Inconsistent matte black infill tone
- Customer complaints related to brand appearance
Root Cause Analysis
The review showed that the color issue was not only a paint problem. The chrome layer, nickel base layer, black infill process, curing cycle, and inspection lighting all affected the final visual result.
- Plating thickness variation changed chrome reflectivity
- Surface defects from die casting affected plating uniformity
- Black infill viscosity variation changed the final tone
- Inspection under uncontrolled lighting missed batch differences
Engineering Challenges
- Controlling electroplating thickness variation
- Maintaining uniform brightness in the chrome layer
- Stabilizing matte black infill appearance in recessed areas
- Reducing die casting surface defects before plating
- Building a batch comparison method using color measurement
Material and Process Decision
Zinc Alloy Material
Zinc alloy was selected because the emblem required a physical 3D structure with stable relief depth. It is suitable for die casting raised shapes and supports electroplating for automotive emblem applications.
Die Casting Optimization
The die casting stage was adjusted to reduce surface defects before plating. Mold temperature control helped reduce visible surface issues that could affect chrome brightness after electroplating.
Nickel Base Layer: 10–15 μm
A controlled nickel base layer was used before chrome plating. The nickel layer helped improve surface stability and provided the base for more consistent chrome reflectivity.
Chrome Top Layer: 0.3–0.8 μm
The chrome top layer was controlled within 0.3–0.8 μm. This range helped maintain the required brightness while reducing visible differences between production batches.
Matte Black Infill Control
The matte black infill process was adjusted by controlling paint viscosity and curing cycle. This reduced tone variation inside recessed areas of the emblem.
Batch Color Measurement
A batch comparison process was added using ΔE measurement. This allowed production teams to compare each batch against the approved sample instead of relying only on visual inspection.
Key Manufacturing Parameters
| Material | Zinc alloy |
| Manufacturing Process | Die casting |
| Product Thickness | 3.0 mm |
| Relief Height | 1.5 mm |
| Dimensional Tolerance | ±0.15 mm |
| Nickel Layer Thickness | 10–15 μm |
| Chrome Layer Thickness | 0.3–0.8 μm |
| Color Control Target | ΔE < 2.0 |
| Final Color Variation | ΔE < 1.5 |
| Mass Production Time | 22 days |
Testing and Validation
Before mass production, Himgo validated the finish under controlled inspection conditions. The focus was not only corrosion resistance, but also appearance repeatability across batches.
- Color consistency measurement using ΔE comparison
- Salt spray testing for corrosion resistance
- Visual inspection under standard lighting
- Coating layer adhesion test
- Batch comparison against approved sample
Quality Control Focus
The project was controlled under Himgo’s quality management process, with special attention to surface finish repeatability.
- Die casting surface review before plating
- Nickel and chrome thickness control
- Black infill viscosity control
- Curing cycle verification
- Batch-level ΔE measurement
- Final visual inspection under consistent lighting
Project Results
- Color variation controlled within ΔE < 1.5
- Chrome brightness variation reduced between batches
- Matte black infill appearance became more uniform
- Customer complaints related to color inconsistency were reduced to zero
- Full production was transferred from the previous supplier to Himgo
When to Use This Solution
- Use when chrome-plated automotive emblems show batch color variation
- Use when matte black infill must remain consistent across production
- Use when front grille badges require stable daylight appearance
- Use when the approved sample looks correct but mass production varies
- Use when batch-level ΔE control is required for brand consistency
FAQ
Why do chrome-plated emblems show different brightness between batches?
Chrome brightness can vary when plating thickness, surface preparation, or base layer consistency changes between production batches.
Why is nickel plating used before chrome plating?
Nickel provides a stable base layer for chrome plating and helps improve surface appearance consistency.
What does ΔE mean in color control?
ΔE measures color difference between a production sample and a reference standard. Lower ΔE means closer visual consistency.
Why is black infill difficult to keep consistent?
Black infill can vary when paint viscosity, filling depth, or curing conditions are not controlled during production.
Is visual inspection enough for automotive emblem color control?
No. Visual inspection should be supported by controlled lighting and batch-level color measurement when brand appearance consistency is required.
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