Therefore, up until now, various methods have been attempted to eliminate these disadvantages, either related to changing the design or the manufacturing material. However, each method has also resulted in a significant increase in the connector costs [10; 11; 12; 13; 14]. In the field of firefighting, in rescue/evacuation operations, firefighters use carbon steel connectors. Although the mechanical strength is satisfactory, the low corrosion resistance makes it necessary to change them often, resulting in a high cost-durability ratio, while any missed inspection of the safety equipment can have serious consequences [15]. Accordingly, to carry out their actions safely, they must rely on the equipment they use, therefore, a durability increase in carabiners can contribute to a safe work environment for firefighters. This paper addresses the issue of the low corrosion resistance of carbon steel connectors and proposed to eliminate it by depositing a zinc-based phosphate layer. Moreover, to prevent the appearance of internal cracks due to mechanical shocks [16], considering the porosity of the phosphate layer that facilitates the adhesion of further coatings, a layer of elastomer-based paint was deposited on the surface. The phosphating process is one of the most widely used methods to increase the corrosion resistance of metallic materials [17]. The components of phosphating solutions are cheap, and the workers who perform the operations do not require high qualification, therefore, low manufacturing costs are involved [18]. Based on previous publications [19; 20], the corrosion resistance to atmospheric, Black Sea water, and pluvial water can be improved by phosphate coatings. However, in the case of firefighting operations, another media (i.e., fire extinguishing solution (FES) can significantly affect the behavior of the metallic components in their equipment. As reported in [21], FES is a highly corrosive environment, therefore, to consider these coatings suitable for the anticorrosive protection of carabiners used by firefighters, it is necessary to evaluate the corrosion behavior of materials over a longer immersion period. Given the importance of the corrosion resistance of connectors used in fall arrest systems, this article analyzes the corrosion behavior, depending on the immersion time in fire extinguishing solution, of three types of samples: base (carbon steel), carbon steel coated with zinc phosphate layer, and carbon steel coated with a zinc phosphate layer and elastomer-based paint layer. In order to analyze the toughness and adhesion between the zinc-phosphate layer and the substrate, in a preliminary experiment [9; 22], scratch and microindentation tests were performed to evaluate the coefficient of friction and microhardness. The tribological analyses exhibited a coefficient of friction of 0.59 a.u. (for C45 steel, the value was 0.24 a.u.) and an increase in the frictional force up to 3.8 N (for C45 steel, the value was 1.5 N). Moreover, the graph exhibited a significant change in the slope at a load of 6.5 N, which was attributed to the phosphate layer penetration. When the microhardness values were compared, we observed a similar behavior between the control sample (C45 steel) and the coated sample. Accordingly, the hardness of the zinc-phosphate sample was 13.12 GPa with a modulus of elasticity of 388.95 GPa. Therefore, by coating the C45 steel with a phosphate layer, a tough, adherent layer with higher coefficient of friction could be obtained.