Corrosion-resistant treatment method for metal weld seam

Abstract

The invention provides a corrosion-resistant treatment method for a metal welding line and relates to corrosion-resistant treatment for metal. According to the corrosion-resistant treatment method forthe metal welding line, a mussel adhesion protein / nanosized palladium composite membrane layer is constructed on the surface of a metal material after the pretreatment of the metal material to be treated, so that the corrosion resistance of the treated metal material is obviously improved; a mussel adhesion protein adopted is a natural environmentally-friendly material which can be extracted fromsea low-value mussels, the resource is rich, the cost is low and the industrialization prospects are good; the mussel adhesion protein adopted is good in anchoring strength and capable of complexingwith metal at the same time; the membrane layer adhesion is good and the prepared composite membrane layer has self repairing capacity at the same time; and the content of Pd adopted is very small andthe particle size of Pd in the prepared composite membrane layer is 100 nm in a diffuse distribution mode, so that the pitting corrosion resistance of the composite membrane layer is strengthened bythe electrochemical protection function of nanosized Pd and the bonding strength with the mussel adhesion protein is strengthened. The method is simple and practicable and strong in operability and has large-scale industrial application prospects.

Description

technical field [0001] The invention relates to a metal corrosion-resistant treatment, in particular to an environment-friendly metal weld corrosion-resistant treatment method. Background technique [0002] Metal materials such as stainless steel are widely used in the fields of petroleum, chemical industry, marine engineering and electric power industry because of their excellent corrosion resistance, processability and high temperature oxidation resistance. For example, stainless steel often needs to be welded and formed during processing. The high temperature generated by welding leads to changes in the chemical composition, microstructure and related properties of the metal materials in the weld zone, which seriously affects the service life and safety characteristics of stainless steel equipment. During the welding process, carbon-chromium compounds are easily precipitated at the grain boundaries of stainless steel, and chromium-deficient phenomena appear near the weld ...

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Problems solved by technology

Y.Zuo etc. propose that electrodeposited coating carries out protective treatment to stainless steel surface (Y.Zuo etc, Study on corrosion resistance of palladium films on 316L stainless steel by electroplating and electroless plating, 2008,50 (10): 2873-2878), but this Anti-corrosion technology that relies on the barrier effect of precious metal coating is expensive and difficult to popularize and apply

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