REPORT

Corrosion of Steel in Concrete

Person	Group	Semestr	Date
1. Borkowski Tomasz	A	I	20 X 08r.
2. Kowalska Ewa
3. Kuźma Dawid
4. Mucha Bartosz
4. Wochnik Michał

1. Examined metal: stainless steal, density: , area:

2. Corrosion environment:

Solution A: 1M HCl

Solution B: Ca(OH)₂

3. Measure performance:

Item	No	Sample characteristics	Corrosion rate calculation
		Exposure time T [min]	Sample mass
			Mass before test mb [g]
1.	2	15	6,4010
2.	55	15	6,8035
3.	13	30	5,7322
4.	42	30	6,7285
5.	39	45	6,8009
6.	40	45	6,2118
7.	29	60	5,0767
8.	16	60	5,2438
9. z	48	60	6,8538
10. z	17	60	5,6625

4. Prepare chart:

To prepare those diagrams we need additional table with some average values of samples taken out in the same time. This table will be the base for our diagrams:

No	Item	Exposure time T [min]	Average mass difference [g]	Average mass loss [g/m2*day]	Average corrosion rate [mm/year]
1.	2,55	15	0,0057	0,0147	0,0419
2.	13,42	30	0,0082	0,0214	0,0608
3.	39,40	45	0,0118	0,0308	0,0875
4.	29,16	60	0,0061	0,0159	0,0452
5. z	48,17	60	0,0001	0,0003	0,0007

5. Conclusions

- Acid environment foster corrosion, significant difference in mass was discovered among samples placed in sulphuric acid solution.

- Alkaline environment protect metal against corrosion, no significant difference in mass was discovered among samples placed in lime water solution.

- Acid rains and contaminated environment can limit lifetime of rebars, and other metal structures

- Corrosion of metal outcome gradually, its tempo is unstable, firstly it’s relatively slow, but when metal pore solution pH is nearly neutral, it’s starting to increase.