本文選題：HO鈍化 + 微堿化��； 參考：《材料保護(hù)》2015年10期

【摘要】：為實現(xiàn)循環(huán)冷卻水微堿化調(diào)質(zhì)的平穩(wěn)控制,抑制換熱器金屬件表面的腐蝕,考察了H68黃銅在以H2O2為鈍化劑的Na2CO3-Na HCO3緩沖溶液中的腐蝕行為。通過正交試驗優(yōu)選了H2O2濃度、溫度及堿度等成膜條件;通過電化學(xué)試驗研究了循環(huán)冷卻水微堿化階段換熱器鈍化膜形成及發(fā)展過程。結(jié)果表明:H2O2濃度為0.6%,溶液堿度為18 mmol/L,溫度20~30℃條件下鈍化后,H68黃銅表面產(chǎn)生了薄而致密的Cu2O膜,在堿度為3.0 mmol/L的碳酸鹽溶液中掛片12 d后,其腐蝕速率僅為0.000 6 mm/a;在堿度為2.0~3.0 mmol/L的微堿化循環(huán)冷卻水中,氧化膜的阻抗和厚度先逐漸降低,48 h之后最低,之后上升,至144 h后達(dá)到穩(wěn)定,并恢復(fù)至初始水平,氧化膜轉(zhuǎn)化為顆粒較粗Cu O膜;本工藝實現(xiàn)了循環(huán)冷卻水微堿化過程中鈍化膜形成與發(fā)展的平穩(wěn)過渡,換熱器H68黃銅件表面形成了致密的氧化膜,既防止了局部腐蝕又抑制了均勻腐蝕。
[Abstract]:The corrosion behavior of H68 brass in Na2CO3-Na HCO3 buffer solution with H2O2 as passivating agent was investigated in order to control the stabilization of microalkalization and tempering of circulating cooling water and to restrain the corrosion of metal parts in heat exchangers.The conditions of H2O2 concentration, temperature and alkalinity were optimized by orthogonal test, and the formation and development of passivation film of heat exchanger in micro-alkali stage of circulating cooling water were studied by electrochemical experiment.The results showed that the thin and dense Cu2O film was formed on the surface of Brass H68 after passivation at 20 ~ 30 鈩，

本文編號：1756958