Experimental Investigation on Corrosion of Cast Iron Pipes

Table 6

Iron oxide minerals detected by XRD.

Pipe	Solution	Inner face	Outer face
1	Static tap water	Fe(OH)3	Fe^3+O(OH)
	Aerated tap water	Fe^3+O(OH), Ca(CO3)	Fe^3+O(OH)
	Aerated solution of 3.5% NaCl	FeO(OH)	FeOOH
2	Static tap water	Fe3O4, FeO(OH), CaO	Fe^3+O(OH)
	Aerated tap water	Fe^3+O(OH), Ca(CO3)	Fe^3+O(OH) Ca(CO3)
	Aerated solution of 3.5% NaCl	FeO, Fe^3+O(OH), Ca3Fe15O25	Fe(OH)3
3	Static tap water	Fe^3+O(OH), FeOOH	Fe^3+O(OH)
	Aerated tap water	FeOOH, FeCl2	Fe^3+O(OH)
	Aerated solution of 3.5% NaCl	Fe^3+O(OH), FeCl3	Fe^3+O(OH)