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    滲鋁不銹鋼鋼管酸洗鈍化液及其工藝研究

    Research on Pickling Passivation Solution and Related Technology for Aluminized Stainless Steel Pipe

    • 摘要: 以硝酸、氫氟酸、硫酸、鹽酸、緩蝕劑、添加劑作為調(diào)整對象，進(jìn)行正交優(yōu)化試驗(yàn)，通過目視法評定酸洗鈍化質(zhì)量，優(yōu)化酸洗鈍化液的合適配比，并且研究在不同酸洗鈍化時(shí)間下不銹鋼鋼管滲鋁涂層的厚度變化情況。結(jié)果表明：含有硝酸10%、氫氟酸5%、鹽酸5%、硫酸5%、緩蝕劑0.75%、添加劑0.5%的酸洗鈍化液酸洗鈍化效果良好；酸洗鈍化2min就能在快速有效地去除氧化皮的同時(shí)保持滲層的完整性；酸洗鈍化30min后涂層剩余厚度仍大于20μm且滲鋁涂層均勻、致密，不銹鋼鋼管表面色澤明麗、平整光滑。

       

      Abstract: With the elements to be adjusted，including nitric acid，hydrofluoric acid，sulfuric acid，hydrochloric acid，the corrosion inhibitor and the additive，the orthogonal test and the visual method are performed to evaluate the pickling passivation quality， optimize the passivation solution ratio， and observe the thickness changes of the aluminized layer of the stainless steel pipe as developed with different pickling passivation operation time. As a result， it is identified that the aluminized layer has a satisfactory pickling passivation quality with the solution containing 10% nitric acid， 5% hydrofluoric acid， 5% hydrochloric acid， 5% sulfuric acid， 0.75% corrosion inhibitor and 0.5% additive. And with such solution to pickle the pipe for just 2 minutes，oxide scale can be removed quickly and effectively without any damage to the aluminized layer， and after operation for 30 minutes， the aluminized layer thickness still remains as over 20 μm，and the layer proper is uniform and dense，while the surface of stainless steel tube looks pretty smooth and bright.

       

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