Effect of environment on corrosion characteristics of newly developed DMR-1700 structural steel

Figures & data

Chemical composition of different steels (wt.%).

Type of
steel	C	Si	Cr	Ni	Mo	Co	Fe
DMR-1700	0.34	2.00	1.00	3.00	<1	<1	Balance

Figure 1 Photograph showing as-coated DMR-1700 steel.

Figure 2 Variation of isolated electrode potential with time for DMR-1700 steel in different environments at room temperature.

Corrosion characteristics of DMR-1700 steel in different environments at room temperature.

Type of	Ecorr	Icorr	Corrosion rate
environment	(mV)	(μ A cm^- 2)	(mpy)
Marine	-644.0	486.7	216.5
Industrial	-683.7	623.4	277.3
Chemical	-568.4	12000	5338

Figure 3 Potentiodynamic polarization curves of the steel in various environments at room temperature.

Figure 4 Cyclic polarization curves of DMR-1700 steel in different environments at room temperature.

Figure 5 Surface morphologies of DMR-1700 steel after corrosion in different environments at room temperature.

Figure 6 Variation of impedance for DMR-1700 steel in different environments at room temperature.

Figure 7 Nyquist plots of DMR-1700 steel in different environments at room temperature.

Figure 8 Phase variation as a function of frequency for DMR-1700 steel in different environments.

Figure 9 Characteristics of 96% zinc-rich coating on DMR-1700 steel.