This study aims to evaluate the efficacy of compounds as corrosion inhibitors for stainless steel in hydrochloric acid solution using gravimetric technique and electrochemical measurements. Stainless steel is resistant to corrosion and rust due to its chromium content, which reacts with oxygen in the air to form a protective coating. Passivation is the process of creating a thin layer of chrome oxide when exposed to oxygen, preventing rust. In this investigation, corrosion inhibitors made from benzoic acid derivatives were applied to 316 stainless steel in a 0.5 M hydrochloric acid solution. The outermost parts of the investigated stainless steel samples were examined using scanning electron microscopy and energy dispersive spectroscopy. The study also assessed the fundamental properties of the studied inhibitors using the dynamic molecular simulation method. The best inhibitor concentration for C3 at 291 K was 1.0 102 M, resulting in the highest inhibition efficiency (88%).In light of the concentrations of the antagonists under research and the impact of ambient the temperature, the current research investigates the efficacy of inhibition. The best inhibitor concentration for C3 at 291 K was 1.0 102 M, and this resulted in the highest inhibition efficiency (88%).

In the past, damaged tissue was removed from the patient's body. But now tissue regeneration using scaffolds and implants are used to repair the damaged tissue and organs. Besides the mechanical properties of metallic biomaterials, they suffer from bioinertness. Using some surface treatment techniques, the bioactivity and also corrosion resistance of titanium implants could be improved. In this study, the effect of H2O2 and alkali treatments on the corrosion behavior of titanium implant in the artificial saliva, surface morphology and phases formed on the surface, was investigated using electrochemical corrosion test, scanning electron microscopy (SEM) and thin film x-ray diffractometry (TF-XRD), respectively. The results indicated that on the surface of H2O2 and alkali treated titanium samples, fine particles of anatase and fine wires of rutile were formed, respectively. The results revealed that the corrosion resistance of alkali treated titanium in the artificial saliva was higher than that of the H2O2 treated titanium sample. The corrosion current density for the untreated, H2O2 and alkali treated titanium samples was about 0. 6×10-8, 5×10-8, 3×10-8A/cm2, respectively.

Effect of incorporating SiAlON nanoparticles at different loading levels (0–12 wt%) on chemical resistance of epoxy coating was investigated by immersion in basic (Na2CO3، pH=11) and salty (NaCl 3.5 wt%) (environments at 85 °C for 60 days. Epoxy resin chemical resistant coating grade based on bisphenol A was used with polyamine hardener as a curing agent. In these testes، surface morphology changes of the samples were studied and compared owing to initiation and propagation of cracks. Results indicate an enhancement in the epoxy nano composite chemical resistance due to the addition of small fraction of SiAlON nanoparticles. Samples containing 3 and 5 wt% of SiAlON nano powders were considered as optimum samples compared to all the other samples، because they showed more resistances to initiation and propagation of cracks and lower permeability in chemical environment in comparison with neat resin and other samples. Also، epoxy coatings containing SiAlON nanoparticles were successfully coated on steel substrates and corrosion electrochemical behavior of these nano composite coatings were characterized by electrochemical impedance spectroscopy (EIS). The electrochemical monitoring of the coated steel over 35 days of immersion in 3.5 wt% NaCl solution at room temperature suggested the positive role of nanoparticles in improving the corrosion resistance of the coated steel.

Human activities, such as production and consumption, generate waste that pollutes environment. This pollution creates unfavorable conditions for humans and other living beings.  Microorganisms, however, offer potential solutions. These tiny can be both beneficial and harmful to humans. While their negative aspects, like pathogenicity or corrosion, have been exclusively studied, this review focuses on the positive potential of these often-threatened bacteria. Here, we explore their ability to clean and biodegrade environmental pollutants. The review draws on research conducted by the authors and other researchers, examining how bacteria responsible for corrosion can biodegrade and purify various pollutants such as PCP, pesticides, detergents, and even bioplastics. Since the biodegradation pathways for these pollutants have been identified and their safety for living organisms considered, the use of such bacteria for environmental cleaning is recommended.

Corrosion cast study is one of the procedures for studying the structure of the blood vessels in a particular tissue or organ. In the present study, the circulatory system of Silver Carp was studied by using four different methods of resin injection. 12 fish with a weight range of 850 -1000 g were obtained from a commercial fish farm. The Fish were anesthetized using a solution of 5% benzocain in 96% ethanol and injected intraperitoneally with heparin (4000 IU/kg). After 40 min, the fish were killed using an overdose of the benzocain solution, and then, fluid artificial resin made on the basis of methylmetacrylate was injected through the caudal artery, bulbus arteriosus, and dorsal and ventral aortas. The Fish were submerged for 24-48 hours in a bath water at room temperature until the polymerization and hardening of methylmetacrylate. Then, they were placed in a 25% KOH solution for 24-48 hours to obtain a maceration of the organic tissue. In this study, various parts of the heart and its vessels, gill vessels, gastric vein, portal vein, hepatic vein, dorsal aorta and its branches, renal and caudal arteries and related smaller vessels were also determined. Overall, it seems that the injection of resin via bulbus arteriosus of the heart was the best and most effective method for the corrosion cast study of the circulatory system in Silver Carp.