Brick Walls and Brickwork - Iron Stains

Background

Iron or rust stains, as they are commonly called, are usually yellow to deep brown. They are more noticeable on cream or light coloured bricks.

Causes

‘Acid burn’ or rust stains can be caused by insufficient pre-wetting of the wall prior to applying hydrochloric acid which is too strong, causing the acid to react with the iron oxides in bricks or mortar.

Staining can also be caused by rusting iron or steel such as lintels, nails and bolts, railings and packaging straps.

Regular wetting from bore water used for irrigation and by welding spatter from welding near brickwork, may also cause iron staining.

Remedy

Brush or spray RidRust to the dry wall, preferably in the sun. The iron stain will normally disappear in 30 minutes to 24 hours. Wash off treated area. Clay masonry should be neutralised with Neutril which should not be washed off.

The phosphoric acid in RidRust will tend to bleach any iron oxides used as colouring pigments. For this reason pigmented mortars will fade, so the entire wall will need to be treated to maintain a uniform appearance. Alternatively keep the solution off the mortar.

In extreme cases a stronger solution of phosphoric acid or a poultice treatment may need to be used.

WARNING

These chemicals are S6 poisons and must be stored safely away from children. See warning and first aid information on individual bottle labels.

Source: Austral Brick Company

For more information on this source please visit Austral Brick Company

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Austral Brick. (2018, August 17). Brick Walls and Brickwork - Iron Stains. AZoM. Retrieved on September 21, 2019 from https://www.azom.com/article.aspx?ArticleID=1401.

  • MLA

    Austral Brick. "Brick Walls and Brickwork - Iron Stains". AZoM. 21 September 2019. <https://www.azom.com/article.aspx?ArticleID=1401>.

  • Chicago

    Austral Brick. "Brick Walls and Brickwork - Iron Stains". AZoM. https://www.azom.com/article.aspx?ArticleID=1401. (accessed September 21, 2019).

  • Harvard

    Austral Brick. 2018. Brick Walls and Brickwork - Iron Stains. AZoM, viewed 21 September 2019, https://www.azom.com/article.aspx?ArticleID=1401.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
Submit