研究目的
To gain deep understanding on failure mechanism of Ti/BDD coated electrodes by a comparative study on the failure process of Ti/ and Nb/BDD electrodes prepared under the same conditions, and to investigate reasons for the difference in service life of the two types of electrodes.
研究成果
The failure mechanism for both Ti/BDD and Nb/BDD electrodes is primarily delamination of BDD coatings, accompanied by corrosion. Ti/BDD electrodes have a shorter incubation period and higher delamination rate due to more pore-like defects in the coatings and lower corrosion resistance of the TiC layer compared to Nb carbides. Improving defect density and corrosion resistance could enhance service life.
研究不足
The study is limited to specific deposition parameters and ALT conditions; variations in process parameters or different electrolytes might affect results. The use of accelerated tests may not fully replicate long-term real-world conditions.
1：Experimental Design and Method Selection:
The study used accelerated life tests (ALT) to compare the failure processes of BDD coated Ti and Nb electrodes prepared by arc plasma chemical vapor deposition (CVD). Diamond growth processes and corrosion behaviors of carbide layers were also investigated.
2：Sample Selection and Data Sources:
Ti and Nb plates were used as substrates. BDD coatings were deposited using a high current extended direct current arc plasma CVD system. Samples included BDD coated electrodes, undoped diamond coatings, and surface carbonized samples.
3：List of Experimental Equipment and Materials:
Equipment included an FEI Quanta 450 FE-SEM for morphology examination, a D/MAX-2000 XRD for phase analysis, a Dektak-150 profiler for surface roughness, a CHI660e electrochemical workstation for electrochemical tests, and a TRADEX MPS 302 power source for ALT. Materials included Ti and Nb plates, sandpapers (200#, 400#, 600#, 800#), ethanol, argon, hydrogen, methane, trimethyl borate, diamond paste (
4：5μm), H2SO4 electrolyte, platinum plate counter electrode, saturated calomel reference electrode, and stainless steel cathode. Experimental Procedures and Operational Workflow:
Substrates were mechanically ground and cleaned. BDD coatings were deposited in two stages (nucleation and growth) with specific gas flow rates. ALT was performed at 1A/cm2 in 1mol/L H2SO
5：Electrochemical tests included cyclic voltammetry, potentiostatic polarization, and potentiodynamic polarization. Morphology and phase components were analyzed at various stages. Data Analysis Methods:
Data from SEM, XRD, profiler, and electrochemical workstation were analyzed to assess coating quality, failure mechanisms, and corrosion behaviors.
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