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.