Aiming PHS 2GPa material and its B-pillar products at object, through the accelerated corrosion procedure, firstly, weight loss and corrosion data are collected to analyze the corrosion rate of metal materials and the compatible performance of the substrate/layer; secondly, and tensile strength and elongation are collected at break, to analyze the residual mechanical properties of the steel matrix; finally, combined with the weight loss and mechanical properties data, the migration behavior of the corrosion mechanism under different corrosion cycles is analyzed. The results show that pitting corrosion occurs at the defect position of the oxide layer on the metal surface, and pitting corrosion can increase the material difference. When the weight loss is 0.92%, the mechanical properties are reduced by about 10.46%. Uniform corrosion can weaken the effect of pitting or perforation on the body, and the mechanical properties of materials are stable. The elongation at break of most samples is <10%, which meets the performance requirements of high-strength steel for vehicles.
KEYWORDS: Carbon, Climatology, Energy efficiency, Temperature metrology, Data modeling, Systems modeling, Aluminum, Sun, Pollution control, Performance modeling
MAC accounts for 7% - 20% of the energy consumption and emission of fuel vehicles. However, With the trend of electrification of automobiles, MAC emissions will further increase. In addition, the refrigerant R-134a for MAC is a powerful GHG, and low-GWP alternatives include R-744 and R-1234yf. Evaluating the emission reduction potential of the life cycle of MAC is of great significance to carbon emission reduction. Based on the LCCP, this paper constructs a electric car MAC emission reduction benefit evaluation model, and analyzes the life cycle emission reduction potential and cost of low-GWP refrigerant MAC in different climate regions. The results show that the R-744 system has the largest emission reduction potential in cold climate regions, with a reduction of about 3.7tCO2eq of single-vehicle emissions, while the R-1234yf system has the largest reduction potential in areas with higher temperatures, and the reduction of single-vehicle emissions is about 1.4tCO2eq. In addition, the life cycle carbon emission reduction cost of alternative refrigerants can be as low as 300 ¥/tCO2eq, which has cost advantages compared with other emission reduction technologies.
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