Investigation of corrosive & Ni-P doped coating by utilizing electroless method.

What is it about?

Corrosion is a major concern for steel structures, requiring significant investments for corrosion resistance. This study focused on applying Ni-P and Ni-P with surfactant electroless coatings to TMT steel rebar. The deposition rate of the electroless bath was investigated at different stirrer rotation speeds, with 300 rpm identified as optimal. Morphological and structural analyses were conducted using FESEM and XRD techniques. The average coating thickness reached 131.47 µm at 300 rpm. The addition of admixtures like lactic acid, succinic acid, and citric acid improved coating efficiency. The corrosion behavior of TMT rebar with Ni-P coating and Ni-P with surfactants was examined using EIS and polarization methods. Corrosion current densities were measured as 3.82µA cm-2, 3.91µA cm-2, and 4.1µA cm-2 for TMT steel, Ni-P coated, and Ni-P with surfactant-coated rebars, respectively.

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Why is it important?

Numerous and demanding engineering conditions must be considered, especially in relation to surface morphological characteristics like wear, corrosion, and durability [1], [2]. To change these surface qualities, a surface coating is required. Materials can exhibit highly unusual cycle changes at the nanoscale, affecting quality, elasticity, conductivity, and other attributes [3]. Traditional surface modification methods like electroplating use a lot of power and leave behind waste that harms the ecosystem, so their use is declining. Electroless plating is a non-galvanic plate technology that has recently attracted the interest of researchers. Electroless Nickel (EN) stored on a different substrate can provide a better adhesive bond and assistance with the correct treatment and quality control. The principal force for reducing nickel metal particles is utilized in the coating process, and a reducing agent is used in the deposition solution. It is helpful for sporadic-shaped items and those with threads, holes, and other irregularities [4]. Electroless nickel deposition is a popular and commonly utilized technique [5].In the electroless coating approach, the composition and thickness of the coating are uniform, and even the most intricate sections of the substrate are covered simultaneously. Low phosphorous electroless has been used in the present work.

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