Polysiloxane-modified porous magnesium hydroxide pretreatment film for electroless plating of highly corrosion-resistant and strongly adhered Ni-P coating on magnesium alloy
Source abstract
Abstract
An electroless nickel-phosphorous plating (ENP) coating with superior resistance to galvanic corrosion and powerful adhesion was achieved on the magnesium alloy by developing a 3-aminopropyltriethoxysilane (APTES)-modified porous Mg(OH) 2 (Mg(OH) 2/APTES) primer. Compared with the bare magnesium alloy and a single-component porous Mg(OH) 2 film, the improved corrosion resistance of the Mg(OH) 2/APTES intermediate layer was confirmed by the electrochemical measurements, which is responsible for the enhanced corrosion protection of the final Mg(OH) 2/APTES/ENP coating. Galvanic corrosion was invisible after exposure of the Mg(OH) 2/APTES/ENP coating to a corrosive solution for 21 days and a salt spray environment for 216 hours. Meanwhile, thanks to the large surface area and mechanical interlocking provided by the porous structure of the intermediate layer, the Mg(OH) 2/APTES/ENP coating displayed powerful adhesion, demonstrated by the tape test and thermal shock methods. These results provide a new perspective for depositing cathodic coatings on anodic substrates with strong adhesion and less susceptibility to galvanic corrosion.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Electrodeposition and Electroless Coatings · Magnesium Alloys: Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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