The effects of simulated acid rain (SAR) on corrosion behaviours of Q235 steel in acidic soil were studied using potentiodynamic polarisation, electrochemical impedance spectroscopy measurements, scanning electron microscopy and X-ray diffraction. The results indicated that the SAR heavily increased the corrosion rate of the steel in the acidic soil. The corrosion rate of the steel increased with decreasing SAR pH values. The corrosive characteristics of the soil obviously increased because of leaching of the acid rain. The corrosion products of Q235 steel surface were mainly composed of Fe 2 O 3 , Fe 3 O 4 and some soil components such as SiO 2 .

The corrosion behaviors of electroless Ni-P coatings deposited on carbon steel in sulfur-bearing solutions were investigated by weight gain test and scanning electron microscopy. The results indicate that the corrosion rate of electroless Ni-P coating was directly related to the sulfur content, immersion time, and test temperature. The corrosion rate increased with the prolonged immersion time. Increasing the temperature can markedly increase the corrosion rate of electroless Ni-P coating. The electroless Ni-P coating had a better corrosion resistance than 316L stainless steel against Cl À corrosion in sulfur-bearing solution.