Effect of different amounts of oil on electrochemical corrosion behavior of DC06 automobile steel
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摘要: 利用恒温恒湿试验、电化学极化曲线测试及微区电化学阻抗测试试验对不同涂油量的DC06钢板在不同温度条件下的腐蚀规律进行了研究。结果表明：DC06钢板的腐蚀速率随温度增加而逐步提高，且当温度为40 ℃时，发生了严重的点蚀现象，随温度增加，腐蚀加快的程度越高。随着涂油量增加至1500 mg/m2，钢板的腐蚀速率下降了20%左右；DC06钢板在粗糙度为1.2 μm时具有最佳的耐腐蚀性能；DC06钢板腐蚀产物的活性溶解程度随温度的增加而加大，防锈油无法在高温条件下形成稳定的保护膜层，钢板表面存在不均匀的微区阻抗特性，共同导致高温条件下DC06钢板耐蚀能力的下降。Abstract: The electrochemical corrosion behavior of DC06 steel plate under different temperatures and oil content was studied by constant temperature and humidity, electrochemical polarization curve and local electrochemical impedance tests. The experimental results showed that the corrosion rate of the DC06 steel plate increased with the increase in temperature under different temperature conditions, and severe pitting corrosion occurred when the temperature was 40 °C. With the increase of oil content to 1500 mg/m2, the corrosion rate of steel plate decreased by about 20%, and with the increase in temperature, the corrosion performance improved; DC06 steel plate with a roughness of 1.2 μm can be obtained the optimum corrosion resistance. Moreover, the active dissolution degree of corrosion products of DC06 steel plate increased with the increase in temperature. The corrosion resistance of DC06 steel at high temperature was reduced due to the failure of antirust oil to form a stable protection film at high temperature and the uneven impedance characteristics of the micro area.
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Key words:
- automobile steel /
- DC06 /
- potentiodynamic polarization curves /
- amount of oil
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图 2 DC06钢板不同涂油量涂油处理后表面形貌
Figure 2. Surface morphologies of DC06 steel plate after different amounts of oil treatment
(a) 0 mg/m2; (b) 400 mg/m2; (c) 800 mg/m2; (d) 1500 mg/m2
图 3 （a）DC06钢板在不同温度和涂油量条件下的腐蚀速率；（b）40 ℃、涂油量为1500 mg/m2条件下的腐蚀产物宏观形貌
Figure 3. (a) Corrosion rates of DC06 steel plate under different temperatures and different amounts of oil treatment; (b) macro morphology of the corrosion product obtained at 40 °C and 1 500 mg/m2 of oil treatment
图 4 不同表面粗糙度条件下的DC06钢动电位极化曲线
Figure 4. Potentiodynamic polarization curves of DC06 steel with different surface roughness parameters
图 5 不同温度下多种涂油量条件下DC06钢的动电位极化曲线
Figure 5. Potentiodynamic polarization curves of DC06 steel under different temperatures and different amounts of oil treatment
(a) 20 ℃; (b) 30 ℃; (c) 40 ℃
图 6 DC06钢在不同涂油量和不同温度下的微区电化学阻抗测试结果
Figure 6. Local electrochemical impedance test results of DC06 steel sample with different amounts of oil treatment
(a) (b) 400 mg/m2; (c) (d) 800 mg/m2; (e) (f) 1 500 mg/m2
表 1 试验钢的主要合金成分
Table 1. Main chemical compositions of the tested steel
% 钢种 C Si Mn Al P S Cr Cu Ti Co DC06 0.001 0.003 0.05 0.028 0.004 0.007 0.011 0.043 0.072 0.024 
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