Experimental Results
Figure 2 shows the deposition effectunder different proportions of electrolyte solution.Compared with the mix solution of Zn2+(0.05 mol/L)and Ca2+(0.01 mol/L),the one with Mg2+(0.05mol/L)and Ca2+(0.01mol/L)can improve the deposition amounts.In addition,when the proportion of Mg2+and Ca2+is(0.050 mol/L):(0.016 7 mol/L)or(0.050 mol/L):(0.010 mol/L),the surface coverage is better than those with Mg2+(0.050 mol/L)and Ca2+(0.007 mol/L).
Figure 3 displays the different materials used as anodes in the experiment.From left to right,they are respectively the ruthenium-iridium titanium plates,the ordinary titanium plates,the graphite rods and the graphite plates.Compared with the other materials,ruthenium-iridium titanium is more stable after the repairing process.The other materials are all damaged to some extend after the electrochemical depositon process.
Figure 2 Deposition effect with different electrolyte solution
Figure 3 Electrodes used in the ex periment
To investigate the influence of the connecting modes of the cathode on the repairing effectiveness,apart from connectingthe negative terminal of the power supply to the rebars(Mode a),the other approach by using the titanium plate(Mode b),which sticks to the side of the cracked specimen,is also employed,as shown in Figure 4.
Figure 4 Modes of cathode connection
Figure 5 shows the coverage the deposition products using different connecting modes.It can be observed that the coverage using Mode a is better than those with Mode b.
Figure 6 shows the microstructures of different deposition products.According to the solution adopted in the experiment,the deposition products are mainly the CaCO3 and Mg(OH)2,as Figure 6(a),(b)display.
Figure 5 Deposition effect with different connection mode
Figure 6 Microstructure of different deposition products