本文選題：AH鋼　切入點：潮差區(qū)　出處：《金屬學(xué)報》2017年11期

【摘要】：利用自制的模擬實驗裝置模擬實海潮差,監(jiān)測了在模擬潮差區(qū)內(nèi)AH32長尺試樣的電偶電流和電極電位變化情況。結(jié)果表明,由于供氧差異形成的宏電池作用,AH32長尺試樣在潮差區(qū)和全浸區(qū)內(nèi)的電極電位分布不均衡,引發(fā)了內(nèi)部的電偶電流,其實質(zhì)為陰、陽極反應(yīng)產(chǎn)生的凈電流。在潮差區(qū)內(nèi),AH32長尺試樣不同部位的電偶電流隨潮位運動發(fā)生周期性變化;當(dāng)潮位最高時,所有部位的電偶電流均處于極大值狀態(tài),且中間潮位部位的電偶電流最大,由此所引起的陽極電流也最大。根據(jù)電偶電流的變化計算出的干燥、潤濕和浸沒狀態(tài)的時間分布表明,AH32長尺試樣在潮位區(qū)不同部位的腐蝕量取決于潤濕和浸沒時間在該部位的分配。各部位在浸沒態(tài)時存在宏電池作用,產(chǎn)生電偶電流。而在潤濕態(tài)下,由于薄液膜的溶液電阻很大,導(dǎo)致宏電池驅(qū)動電位幾乎等于在薄液膜上的電壓降,因此宏電池作用極弱,且不產(chǎn)生電偶電流。潤濕時間和潤濕電量的關(guān)系顯示,潮位運動中AH32長尺試樣的最大潤濕時間出現(xiàn)在平均中潮位以上的部位,表明因潤濕引起的該部位的腐蝕失重最大。結(jié)合由浸沒態(tài)引起的平均中潮位腐蝕失重最大的結(jié)果可以確定,在潮水漲落過程中AH32長尺試樣的最大腐蝕失重量應(yīng)出現(xiàn)在平均中潮位偏上的部位,這與腐蝕速率的測量結(jié)果一致。
[Abstract]:The electric coupling current and electrode potential of AH32 long scale sample in the simulated tidal range were monitored by using a self-made simulation experiment device. The results show that the electric current and electrode potential of the AH32 long scale sample in the simulated tidal range are measured. Due to oxygen supply difference, the electrode potential distribution of AH32 long ruler sample is unbalanced in the tidal range and the whole immersion zone, which leads to the internal galvanic current, which is essentially negative. The net current produced by anodic reaction. The coupling current of AH32 long ruler specimen changes periodically with the tide level movement in the range of tidal difference. When the tide level is highest, the coupling current of all parts is in the state of maximum value. The coupling current at the middle tide level is the largest, and the anode current caused by it is also the largest. The time distribution of wetting and immersion states indicates that the corrosion amount of AH32 specimen in different parts of tidal zone depends on the distribution of wetting and immersion time in this part. In the wet state, however, because the solution resistance of the thin liquid film is very large, the driving potential of the macro cell is almost equal to the voltage drop on the thin liquid film, so the action of the macro cell is extremely weak. The relation between wetting time and wetting quantity shows that the maximum wetting time of AH32 long scale specimen appears in the position above the average middle tide level in tidal level movement. The results show that the corrosion weight loss of this part is the largest due to wetting. Combined with the results of the maximum corrosion loss at the average mid-tidal level caused by immersion, it can be determined that, In the process of tidal fluctuation, the maximum corrosion weight loss of AH32 long scale specimen should appear in the position above the average middle tide level, which is consistent with the result of corrosion rate measurement.
【作者單位】： 中國科學(xué)院金屬研究所;
【基金】：國家自然科學(xué)基金項目No.51671200 國家高技術(shù)研究發(fā)展計劃項目No.2015AA034301 國家腐蝕平臺基金 中國科學(xué)院海洋研究所海洋環(huán)境腐蝕與生物污損重點實驗室資助項目No.MCKF201611~~
【分類號】：TG172.5

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