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  1. #11
    AgX
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    There are stainless steels that can withstand sulphuric acid.
    Though with the actual bleach solution things may change.


    Stephen, depending on the severity of this issue you might try to get samples of higher resistance steels and if it works get those parts off stock or having them machined.
    Last edited by AgX; 07-03-2010 at 04:22 AM. Click to view previous post history.

  2. #12
    Stephen Frizza's Avatar
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    the corrosion issue isn't a problem I just take it as part of the process, one thing i am about to start is that at the end of each day removing the bleach racks and letting them soak in water overnight to slow the corrosion down, but as i mentioned I have hundreds of spares for exactly this issue. thanks for the heads up on certain stainless steels that can withstand sulphuric acid I didnt know this.
    "Its my profession to hijack time" ~ Stephen Frizza.

  3. #13
    Bob Carnie's Avatar
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    I had a ciba chrome Px3 unit for 15years and never saw that kind of erosion in the bleach rack.

    Quote Originally Posted by Stephen Frizza View Post
    Regular maintenance of Ilfochrome processors is a must, there are many components that need regular checking especially in the Bleach bath. I have attached a sample of why regular maintenance is a MUST. in the picture attached I show a normal Bolt for a bleach rack on the left before it has been installed into a processor. The 2 screws on the right are from 6 months exposure to ilfochrome bleach. note how the bleach has dissolved the screws. If such corrosion isn't seen to this can cause huge problems to the machine. parts need constant replacement. I think this is a good example as to how strong the chemistry in this process is.

  4. #14
    Stephen Frizza's Avatar
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    what was the make of the machine bob? was it one of the Colenta processors?
    "Its my profession to hijack time" ~ Stephen Frizza.

  5. #15
    Bob Carnie's Avatar
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    Yes , There were a run of Colenta Ciba machines made back in the early mid 90's I bought a 32 inch.
    These machines were made Ciba Specific and had a lot of overkill, that you do not see on regular processors converted to ciba.

    Quote Originally Posted by Stephen Frizza View Post
    what was the make of the machine bob? was it one of the Colenta processors?

  6. #16
    Stephen Frizza's Avatar
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    Ah the machine I have is the 50inch actually our machine was the prototype. the first ever of its kind. It wasnt meant for sale but it works a charm.....
    "Its my profession to hijack time" ~ Stephen Frizza.

  7. #17
    Ian Grant's Avatar
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    Stephen, what material is the bolt screwing into, where, and what function ? I have quite a bit of experience of working with highly corrosive boiling acids (I built gold refineries).

    Ian

  8. #18
    Stephen Frizza's Avatar
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    The bolt photographed goes into the rack supports for the bleach. the rack supports are made of plastic. and the corrosion is not a problem with regular maintenance. I simply posted the image of these screws as an example of the strength of the bleach on machine parts over long periods of time.
    "Its my profession to hijack time" ~ Stephen Frizza.

  9. #19
    Ian Grant's Avatar
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    OK, get some bolts made from Polypropylene or PTFE, or whatever the racks are made from. They can be made very easily, and they won't cost much at all.

    I used to buy filter housings from the US, the types used in some photo-labs, the steel nuts & bolts used would corrode badly, in the end I had my own filter housings made and that was the end of the problems, and the cost dropped substantially.

    Ian

  10. #20
    Mick Fagan's Avatar
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    Gold Refineries???????

    I've never had a woman that was that expensive!

    Mick.

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