For electrically conductive adhesives (ECAs) interconnection, adequate electrical, mechanical and thermal performance are crucial for long-term service reliability. The work focused primarily on analyzing the effects of environmental aging on the reliability and failure mechanism of ECAs joints. In this paper, high temperature and humidity (85 °C, 85%RH, 1000 h), thermal shock (−40 °C to 125 °C, 1000 cycles) and thermal aging (125 °C, 1000 h) tests were performed to study the reliability of the ECAs. Additionally, the fracture modes were investigated by mechanical shear strength testing before and after the reliability tests. The interfacial microstructure of the ECAs was investigated and the fracture mechanism of ECAs was characterized. The study showed that the reliability of the ECAs was improved compared with conventional ECA1 and ECA2.
Mengjun Jia,Ling He,Aizhao Pan,Xiaoqin Ma,Shengying Huang,Stefan Simon
Hybrid coatings have been used as the protective materials on sandstone monuments for many decades. But the protective performance is strongly depended on the adhered interface between protective coating and matrix. To find out how the hybrid coatings affect the adhesive performances and anti-salt damage behaviors during Na 2 SO 4 salt-loaded hygrothermal aging (SLHA) cycles, the surface/mechanical properties of three silica-based hybrid coatings (S1-S3) and their anti-salt damage results (surface weathering appearance, mass change, porosity, water absorption and morphology of pore structures) of the sandstones adhered by these hybrid coatings have been evaluated and discussed. The results reveal that dendritic Na 2 SO 4 crystals cover on the sand grains in both natural and hydrophilic silica/PVA (S1) adhered sandstones, which makes the adhered sandstone perform the least damage. Owing to the high adhesive and mechanical strength , S1-adhered sandstones perform the best anti-salt damage during Na 2 SO 4 SLHA cycles. While the needle-like and cumulate ellipsoidal Na 2 SO 4 crystals precipitate in the pores and interstices result to much severe salt damaged in adhered sandstones by hydrophobic P(GMA-MAPOSS) (S2) and PGMA- g -P(MA-POSS) (S3) during Na 2 SO 4 SLHA cycles, although they enhanced the strength of adhesive pore walls. Actually, the macro salt damage behaviors on the sandstones treated by different hybrid coatings are proved to be a competition result of different crystallization patterns. Therefore, the pore interface adjusted by protective coatings should be one of the decisive factors for anti-salt damage during the sandstone protection.
The coupled factors of high temperature, high humidity, and high salinity in tropical marine atmospheres severely threaten the long-term service performance of power transmission and transformation infrastructure. This paper establishes an accelerated cyclic testing protocol (salt spray → drying → damp heat → drying) to evaluate performance and elucidate the dynamic corrosion failure mechanisms of the organic Zn14Al1.4 composite coating. By integrating multiphysical characterization techniques (SEM, EDS, XPS) with electrochemical analysis, this study for the first time elucidates the dynamic transformation of corrosion products: initially dominated by Zn(OH)2, progressing to complex passive phases such as Zn5(OH)8Cl2·H2O, Zn5(OH)6(CO3)2, and Zn6Al2(OH)16CO3in the mid-term, and ultimately dominated by Fe-based products (FeO, Fe2O3, Fe3O4, FeOOH) that drive interfacial failure. And a four-stage corrosion evolution model was defined: incubation period, accelerated degradation phase, substrate nucleation stage, and catastrophic failure phase. The investigation reveals a shift in the coating/substrate interface failure mechanism from purely physical barrier effects to electrochemical synergy, providing a theoretical framework for the optimized design and service-life prediction of anticorrosive coatings for transmission and transformation equipment in tropical environments.
危险品化学品经营许可证（带存储）