Resistance of alloys in seawater

Using the methods of optical metallography and scanning electron microscopy, a systematic study of the features of destruction of structurally and crystallographically textured titanium blanks after low-cycle tests in synthetic seawater containing 3.5% NaCl was carried out. It is shown that corrosion-resistant structurally and crystallographically isolated regions with a basic orientation of the interface and a width of 20−30 µm, which periodically lay over the entire thickness of the workpiece in increments of 100−170 µm, are responsible for reducing fatigue life. The main types of corrosion of steels in sea water are considered. It is shown that for austenitic steels there is a duality regarding the presence of chlorine in seawater: it reduces the activity of microbiological corrosion but increases the risk of pitting and crevice corrosion.