A failed salt spray result needs a review of the tested sample, process and test conditions. Adding thickness alone may not resolve the cause. The following five areas are a troubleshooting checklist, not a diagnosis of every failure.
1. Pretreatment thoroughness
Residual contamination or oxide can affect adhesion and contribute to local defects. Review the incoming surface, preparation records and observed defect locations before deciding on corrective action.
2. Nickel layer thickness
For nickel/chromium systems, review the specified coating stack and thickness at agreed measurement locations. Thickness is one factor; a single measurement does not explain every failure or establish performance for a different part.
3. Coating porosity
Examine pores, damaged areas, welds and rack-contact locations where corrosion may start. Review any proposed coating-system change with the processor rather than assuming that duplex nickel, nickel-seal or other unconfirmed processes are available at Guoshuo.
4. Test setup and agreed post-treatment
Check the test method, sample preparation, exposure duration, inspection area and acceptance criteria against the order. Any post-treatment must be specified for the actual coating; it is not a universal step or a guarantee of a particular salt spray duration.
5. Substrate and system match
Confirm the base material and grade, the actual coating stack and the intended use. A report for another substrate or product cannot by itself establish that this part will meet its specification.
Summary
| Factor | How it shows up |
|---|---|
| Incomplete pretreatment | Blistering, local rust spots |
| Thin nickel | Widespread poor corrosion resistance |
| High porosity | Pinpoint corrosion |
| Test or post-treatment mismatch | Result not comparable with the agreed specification |
FAQ
Does a failed salt spray always mean the coating is too thin?
No. Review preparation, thickness, local defects, test setup and substrate compatibility. The cause requires evidence from the actual sample and process.
How do you improve salt spray performance?
Identify the cause first, agree any changes within the confirmed process capability, then test representative samples to the agreed acceptance criteria. Additional thickness or post-treatment is not a universal remedy.
How many hours of salt spray can you achieve?
We do not promise 72 hours or any other duration for every product. Please specify the test method, duration, inspection area and acceptance criteria. Feasibility and results must be confirmed for the actual substrate, coating system and tested sample. Reports apply only to their stated product and test conditions. See salt spray testing explained. Request a quote.