摘要：低溫多效海水淡化技術因不受原水濃度限制、出水水質高、對海水溫度不敏感、在較低的溫度下操作（最高操作溫度不超過70℃），可以利用低品位熱源和廢熱等優勢，近幾年國內外應用發展迅速。傳熱管是低溫多效海水淡化裝置的核心部件，其成本約占低溫多效海水淡化裝置的20～40%，對傳熱管的要求是高的傳熱性能、高的阻垢性能、高的耐蝕性能，且價格低廉。鋁黃銅是目前最常用的傳熱管材質。從國內外已運行的低溫多效海水淡化裝置運行狀況來看，銅合金換熱管的耐蝕性是裝置運行可靠性的關鍵因素。本工作采用“海水淡化兩效蒸餾模擬腐蝕裝置”，考察了桂林某公司預氧化退火工藝和光亮退火工藝生產的兩種鋁黃銅管在真實海水中的耐腐蝕性能，采用電化學阻抗譜、動電位極化曲線結合表面分析測試，研究了預氧化退火HAl77-2管在海水中耐腐蝕性能。研究結果表明，預氧化HAl77-2管在海水中的耐蝕性和抗結垢性均比光亮HAl77-2管強。預氧化退火工藝使HAl77-2銅合金管的耐蝕性能得到一定程度的提高。

關鍵詞：低溫多效；HAl77-2 合金管；海水淡化；耐腐蝕；抗污垢

中圖分類號： TG 174.4         文獻標識碼：A       DOI：10.6052/0459-1879-12-345
 
Corrosion resistance of the pre-oxidized HAl77-2 tube used in low temperature multi-effect distillation desalinization ^1）
Zeng Hui-jing^*, Gao Frank⁺, Gao Lixin^*, Zhang Daquan^*
*（School of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
⁺( International Copper Association Shanghai Office, Shanghai 200020，China )
Abstract：The performance of pre-oxidized HAl77-2 tube for seawater desalinization was studied by simulative two-effect distillation corrosion experimental installation. The electrochemical impedance spectroscopy and the potentiodynamic polarization curve method were used to investigate their corrosion resistance property. The surface morphology after simulated corrosion test was examined by the scanning electron microscopy (SEM). The results show that the corrosion resistance and the anti-fouling capability of the pre-oxidized HAl77-2 tube are superior to the ordinary bright annealed HAl77-2 tube.
Key words：low temperature multi-effect distillation(LTMED); HAl77-2 alloy tube; seawater desalination; anti-corrosion; anti-fouling