Client Background
Our client is a professional outdoor lighting manufacturer with products sold globally. After 2–3 years of use (around the end of the warranty period), their products began to fail in large numbers due to serious rust, corrosion, and surface coating failures.
This caused heavy complaints, warranty costs, and damage to their brand reputation.
Challenge
The client strongly suspected supplier quality issues, but:
- The supplier insisted all goods passed inspection before shipment
- Inspection reports provided by the supplier appeared normal
- Frequent disputes and finger-pointing between client and supplier
- The client had no professional SQE team based in China
- Previous visits were only conducted by purchasing staff without quality expertise
- Real root cause could not be identified, and the quality crisis continued
The client then appointed PowerBull as their professional quality representative to conduct a full, independent investigation.
Our Investigation & Root-Cause Discovery
We performed an on-site audit of their key coating supplier and uncovered critical hidden risks:
1. The direct “supplier” was only a trading company, not a real manufacturer.
2. They had subcontracted the plating / powder coating work to a small, unregulated workshop with minimal quality management.
3. On-site audit of the tier-2 coating workshop revealed:
- No formal SOP (Standard Operating Procedure)
- No SIP (Standard Inspection Procedure)
- No standardized pre-treatment process for plating or powder coating
- Poor process control, inconsistent coating thickness and adhesion
- Inadequate anti-corrosion treatment, leading to early rust and failure
- Internal quality checks were incomplete or fabricated
The real root cause was uncontrolled subcontracted processing — not the surface condition at shipment, but long-term durability and anti-corrosion performance.
Solution & Actions Taken
We provided full professional support to resolve the long-term quality issue:
- Verified and documented the real root cause of rust and coating failure
- Helped the client terminate high-risk, unqualified subcontractors
- Recommended and qualified reliable, professional coating manufacturers
- Established standardized pre-treatment, coating, and inspection processes
- Implemented mandatory SOP, SIP, and in-process quality control
- Provided professional supplier audit, quality control, and continuous improvement systems
- Built a stable, traceable supply chain for long-term reliability
Result
- Quality issue of rust and early coating failure was permanently resolved
- Long-term product durability and anti-corrosion performance met international standards
- End-customer complaints and warranty costs were drastically reduced
- Client’s brand reputation was restored
- A professional, transparent, and controllable supply chain was established
Client Value
PowerBull acted as the client’s professional SQE team in China, uncovering hidden quality risks that non-specialist staff could not detect. We transformed a long-term quality dispute into a structured, sustainable solution.
This case proves our strength in:
- Professional supplier & sub-supplier audit
- Root-cause analysis
- Quality system reconstruction
- Long-term supply chain risk control
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