發(fā)布時間：2018-07-07 08:18

  本文選題：Q235鋼 + 化學(xué)鍍��； 參考：《華北理工大學(xué)》2015年碩士論文

【摘要】：Q235鋼是海洋中應(yīng)用最為廣泛的普碳鋼,但海洋環(huán)境會對Q235鋼造成腐蝕破壞,腐蝕到一定程度會引發(fā)海洋事故造成經(jīng)濟損失。所以了解Q235鋼在海水中的耐蝕性并采取一定的防腐措施顯得尤為重要。采用靜態(tài)掛片實驗方法研究Q235鋼在模擬海水全浸區(qū)的耐腐蝕性能、腐蝕機理。結(jié)果表明:Q235鋼在模擬海水全浸區(qū)達(dá)到均勻腐蝕時的腐蝕速率大約在0.041mm/a,屬于耐蝕4~5級。腐蝕先以點蝕狀態(tài)開始,隨著腐蝕時間的增加,點蝕坑增加,并且逐漸連接起來,點蝕坑消失,形成均勻腐蝕層。腐蝕層分為兩層,外銹層為γ-Fe OOH,內(nèi)銹層為Fe3O4、α-Fe OOH、γ-Fe OOH、β-Fe OOH的混合物,腐蝕產(chǎn)物的形成主要是氧元素的擴散過程。為了提高Q235鋼在海水中的耐蝕性,采用化學(xué)鍍方法在Q235鋼基體上鍍Ni-P鍍層。以化學(xué)鍍Ni-P工藝參數(shù)中的絡(luò)合劑和溫度為主要考察因素,對化學(xué)鍍Ni-P工藝配方進(jìn)行了初步探索并通過正交實驗進(jìn)一步對工藝進(jìn)行優(yōu)化,得到的最佳工藝為:絡(luò)合劑A 8g/L,絡(luò)合劑B 10g/L,溫度85℃。溫度是對鍍層沉積速率和鍍層腐蝕速率影響最大的因素。采用電化學(xué)實驗法,對Ni-P鍍層及Q235鋼的耐蝕性進(jìn)行對比分析。Q235鋼的自腐蝕電位-0.54V,極化電阻為704歐。Ni-P鍍層的自腐蝕電位為-0.49V,極化電阻為1501歐。結(jié)果表明Ni-P鍍層的耐海水腐蝕性能比Q235鋼好。
[Abstract]:Q235 steel is the most widely used carbon steel in the ocean, but the marine environment will cause corrosion damage to Q235 steel, which will lead to economic loss caused by marine accidents to a certain extent. So it is very important to know the corrosion resistance of Q235 steel in seawater and take some anticorrosive measures. The corrosion resistance and corrosion mechanism of Q235 steel in simulated seawater immersion zone were studied by static strip hanging test method. The results show that the corrosion rate of WQ235 steel is about 0.041 mm / a in the simulated seawater immersion zone. With the increase of corrosion time, the pitting pits increase, and gradually connected together, the pitting pits disappear to form a uniform corrosion layer. The corrosion layer is divided into two layers, the outer rust layer is 緯 -Fe OOH, and the inner rust layer is the mixture of Fe 3O 4, 偽 -Fe OOH, 緯 -Fe OOH, 尾 -Fe OOH. The formation of corrosion products is mainly the diffusion process of oxygen elements. In order to improve the corrosion resistance of Q235 steel in seawater, Ni-P coating was deposited on Q235 steel substrate by electroless plating. With the complexing agent and temperature of electroless Ni-P plating as the main factors, the process formula of electroless Ni-P plating was preliminarily explored and optimized by orthogonal experiment. The optimum conditions are as follows: complex agent A 8 g / L, complex agent B 10 g / L, temperature 85 鈩，

本文編號：2104356