The durability behavior of prepainted steel sheets for construction produced by different companies was studied by neutral salt spray analysis and accelerated UV ageing test with the aid of glow discharge optical emission spectrometry (GDS). The salt spray results suggested that both prepainted steel sheets possessed high corrosion resistance to neutral NaCl solution, in accordance with the demands of domestic and overseas standards. The corrosion protection of the sample produced by WISCO was higher than the other sample. The UV ageing results indicated that their UV radiation resistance could meet the national and European standards. What's more, the sample from WISCO had better ageing performance, getting to the highest grade R UV4. The reason was that the distribution of Ti pigment in greyish-white dope of WISCO's sample was more uniform and deeper.
The corrosion and inhibition effect of magnesium-based rare-earth containing alloy Mg-10Gd-3Y-0.5Zr (GW103) was studied in an ethylene glycol (EG) solution mixed with organic inhibitors. The inhibition efficiencies of piperazine and pyrazine inhibitors on the corrosion of GW103 were compared by means of potentiodynamic polarization curve, electrochemical impedance spectroscopy (EIS) and weight loss measurements. It was found that the corrosion process of GW103 alloy in EG solution was hindered by these two inhibitors and the inhibition of pyrazine was more effective than that of piperazine. It was implied that pyrazine could be an effective inhibitor for GW103 in an ethylene glycol coolant solution.
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