The aim of this research is to study the corrosion behavior of carbon steel, because corrosion is common defects that occur to the devices and machinery after manufactured. Plain –carbon steel is considered as one of the most important minerals used in industrial applications. The direct effect on the corrosion behavior of steel is heat treatments because of galvanic corrosion which building up between its microscopic phases. In three methods carbon steel has been treated thermally which the hardening, normalizing, and annealing. Used salt water as corrosive media for a period of (30, 45, 60) days.  The steel contains chemical compounds to show its effect on the corrosion. To compare between the results and to determine corrosion rate used weight loss. The results obtained show that the lowest corrosion resistance is for the hardened steel and the corrosion resistance of the annealing steel is the greatest, while the corrosion  resistance of the normalized steel is in-between them.

The aim of this research is to study the effect of changing the geometric shape of wires which are used to reinforce the composite materials, The composite material consists of polyester as a matrix (87% wt.) and wires (13% wt.) as a reinforced that have different cross-section area shapes used (circular, triangle, and square). A bending test was performed on composite materials and matrix material, the results showed that the composite material reinforced with steel wires with a circular shape has a bending strength higher than composite materials reinforced with wires that has a triangle and square shape in a cross-section area, the results also showed that the lowest bending strength was for the matrix material.