Phosphorous concentration in the surface layer of plate effectively increases its resistance to atmospheric corrosion.
由于磷在钢板表面的富集有效地提高了钢板的耐大气腐蚀性能。
The test bridge made of a new type of weather resistant steel of NH35Q steel has a strong resistance to atmospheric corrosion.
使用NH35Q耐候钢新钢种制作的试验桥，耐大气腐蚀能力强。
The total quantity of corrosion surface defect is decreased due to the decrease of grain boundary energy with the increase of grain size and the atmospheric corrosion resistance is increased.
但是晶粒尺寸增大后晶界处因局部腐蚀电流密度增大将会在局部造成更深的腐蚀坑槽并降低耐候性；
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