Basic process of coating/plating failure analysis and detection

Date：2022-12-06 16:08:42 Views：1108

With the development trend of production and technology, coating/coating raw materials have gradually appeared in our sight and rapidly developed throughout people's daily life. In general, the general development trend of the technology of raw materials for coating/coating in the future is to achieve excellent performance, high functionality, intelligent systems and environmental protection. According to a series of analysis and certification methods of failure analysis, the direct cause and principle of its invalidity can be searched, which has a key practical significance in improving product quality, processing technology improvement, compulsory litigation and other fields.

Coating/plating refers to coating a layer of plastic on the metal surface painted/plated on some articles for beauty or storage, or a thin layer of metal or a thin layer of precious metal for imitation, and coating a thin layer of such precious metal on the surface of ordinary metal.

The preparation of composite coating is a process in which one or more insoluble solid particles are added into the plating solution to make the solid particles codeposition with metal ions. It is actually a metal matrix composite. Failure mode delamination, cracking, corrosion, blistering, coating/coating peeling, discoloration failure, etc.

Critical Failure Mode

Hierarchical, cracking, etching, blistering, coating/coating falling off, discoloration failure, etc.

Common failure analysis methods

Analysis level of chemical composition of raw materials:

Fourier transform microscope infrared quantitative analysis (FTIR)

Microscopic confocal Raman spectrometer (Raman)

Transmission electron microscope and energy spectrum analysis (SEM/EDS)

X-ray fluorescence quantitative analysis (XRF)

GC-MS

Cracking gas chromatograph mass spectrometry (PGC-MS)

Magnetic resonance profiling (NMR)

Auger electron spectroscopy (AES)

X-ray photoelectron spectroscopy (XPS)

X-ray diffractometer (XRD)

TOF-SIMS

Thermal analysis of raw materials:

Differential scanning calorimetry (DSC)

Thermogravimetric analysis (TGA)

Thermal mechanical equipment analysis (TMA)

Dynamic Thermomechanical Equipment Analysis (DMA)

Analysis level of raw material fracture surface:

Yoga posture optical microscope (OM)

Transmission electron microscopy (SEM)

Material science function test:

Tensile strength, bending strength, etc

Failure analysis process

(1) Failure background investigation: product failure phenomenon, failure environment, failure stage (design debugging, pilot test, early failure, mid-term failure, etc.), failure ratio, failure history data

(2) Non destructive analysis: X-ray fluoroscopy, ultrasonic scanning, electrical performance test, morphology inspection, local composition analysis, etc.

(3) Destructive analysis: opening inspection, profile analysis, probe test, focused ion beam analysis, thermal performance test, body composition test, mechanical performance test, etc.

(4) Analysis of service conditions: structural analysis, mechanical analysis, thermal analysis, environmental conditions, constraints and other comprehensive analysis.

(5) Simulation verification experiment: the simulation experiment is designed according to the failure mechanism obtained from the analysis to verify the failure mechanism. Note: The site and samples in case of failure must be carefully protected to avoid secondary injury caused by force, heat, electricity and other factors.

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