iTutor Chemistry Updates

Recently I have done a home experiment (for interest)about electrolysis. I made a table salt solution and then pass some electricity into it. Normally, people will use carbon as the electrodes due to their inactivity(2NaCl+2H₂O--> 2NaOH+H₂+Cl₂). However I have used Fe as the conducting wire, and it results in the following way. First some colourless bubble is released near the negative electrode. A smell of chorine gas is detected. Then after several hours, no more smell is given out, but instead the colour of solution changes. Also, a brown precipitate is found. Certainly I see that the precipitate seems to be insoluble in water. Does anyone know what is the result and that solution? Thanks for answering!!☺