The AISI 316L type of stainless steel is a popular steel material, as it has excellent corrosion resistance in aqueous solutions at ambient temperatures. However, the application of the AISI 316L stainless steel is limited by its relatively low hardness and low wear resistance. In this study, the electroless Ni-B coating was deposited on the AISI 316L stainless steel, and its structural, tribological and corrosion properties were characterised. Microstructural analysis showed that the electroless Ni-B coating deposited on the AISI 316L steel substrate exhibited a typical cauliflower-like structure exhibits an amorphous growth. From this study, it may be concluded that this process cannot only improve the hardness and wear resistance of the 316L stainless steel, but can also provide cathodic protection without losing or sacrificing the original properties of the 316L stainless steel.
Boron compounds that are produced from boron ores are important industrial materials. In this report, an alternative method for the formation of boric acid obtained via the reaction between colemanite and sulfuric acid in aqueous media was studied. For this purpose, the kinetics and mechanism of the dissolution of colemanite were investigated in saturated boric acid solutions that were saturated with SO 2 gas. In the experiments, the particle size, solid-to-liquid ratio, stirring speed, and temperature were chosen as parameters. As a result, the conversion rate increased as the particle size and solid-to-liquid ratio each decreased and the temperature increased; however, the effect of stirring speed was very minimal. In addition, the conversion rate was determined to fit the Avrami model, and the activation energy of the process was estimated to be 50.15 kJ/mol. The integrated rate equation for this conversion was determined to be as follows: -ln(1 -X) ) (1.26 × 10 5 )[SO 2 ]D -1.52
Colemanite is one of the most important underground riches of Turkey, having approximately
60% of the world boron deposits, and it has a large portion in the deposits. When colemanite
having a 2CaO·3B2O3·5H2O formula is mined naturally, it contains various clay minerals. During
boric acid production by a sulfuric acid process, some kinds of clay minerals cause difficulties in
the filtration process. In this study, the dissolution of Kestelek colemanite has been investigated
in SO2-saturated water as an alternative method to the sulfuric acid process to remove the
difficulties faced in filtration. The particle size, solid-to-liquid ratio, stirring speed, and reaction
temperature have been chosen as parameters in the experiments. It was determined that the
dissolution rate of colemanite increased with decreasing particle size and solid-to-liquid ratio
and increasing reaction temperature but was unaffected by the stirring speed. The activation
energy of the dissolution process was estimated to be 39.53 kJ·mol-1. A semiempirical model
was found by using experimental data and package programs, as follows: 1 − (1 − X)1/3 = 3.423
× 104
D
-0.70(S/L)-0.65e-4754/
T
t. Evaluation of the experimental data and semiempirical model shows
that the dissolution process is controlled by a chemical reaction.
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