(1. 北京科技大學(xué) 腐蝕與防護(hù)中心，北京 100083；
2. 上海寶山鋼鐵研究院 焊接與表面技術(shù)研究所，上海 201900)
摘 要: 通過在不同氧含量環(huán)境中對(duì)汽車熱鍍鋅板進(jìn)行泥漿附著試驗(yàn)，采用掃描電鏡、X射線光電子譜和拉曼光譜等手段，研究在間歇通O2和通N2情況下汽車用鍍鋅板的腐蝕行為。結(jié)果表明：在間歇通O2的情況下，鋅層大部分被腐蝕，而且在基體上有一些紅銹和黑銹產(chǎn)生，鍍鋅板表面的腐蝕產(chǎn)物呈現(xiàn)著不均勻的針狀物；而在間歇通N2時(shí)，鍍鋅板的鋅層脫落面積較少，基體上沒有產(chǎn)生紅銹，腐蝕產(chǎn)物呈大塊狀；在間歇通O2和通N2的情況下，鍍鋅板的腐蝕速率先增后降，在200 h時(shí)，前者的腐蝕質(zhì)量損失速率是后者的2倍左右；鍍鋅板附著庫(kù)爾勒泥漿時(shí)的腐蝕過程受氧去極化過程控制。
關(guān)鍵字: 熱鍍鋅板；堿性泥漿；附著；腐蝕行為
automotive hot-dip galvanized steel under alkaline mud adhesion
（1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;
2. Institute of Welding and Surface Technology, Shanghai Baoshan Iron & Steel Group Corporation,
Shanghai 201900, China）
Abstract: In environments of different oxygen contents, the corrosion behaviors of hot-dip galvanized (HDG) steel sheet used in automobile under mud adhesion were investigated by scanning electronic microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The results show that the zinc coating is eroded mostly, and some red rust and black rust appear on the substrate in the environment of oxygen supplied intermittently. The corrosion products on the galvanized steel sheet are needle-like objects. While in the environment of nitrogen supplied intermittently, a little area of the zinc coating is erode, and no red rust appears on the substrate. Corrosion products form on the blocks. With time prolongs, the corrosion rates of mass loss increase firstly whereas then decrease, and the corrosion rate of mass loss with oxygen supply is about two times greater than that with nitrogen supply under the mud adhesion up to 200 h. The corrosion processes of the galvanized steel sheet under alkaline mud adhesion are controlled by oxygen depolarization reactions.
Key words: hot-dip galvanized steel; alkaline mud; adhesion; corrosion behavior
