Acid pickles do not remove grease or oil very well. Efficient cleaning prior to the pickling operation is important to ensure the pickling is carried out quickly and properly. It also ensures grease does not carry over to the galvanizing kettle. This helps to prevent blinding of filters and reduces the amount of ash build up on the kettle. Poor cleaning can also prevent the correct fluxing of the job, giving rise to black spots or even large black patches in severe cases.
MacDermid can supply a range of degreasing chemicals and acid inhibitors and degreasing additives to ensure correct preparation of the steel surface. After galvanizing our water-based Hydroclear product will ensure the zinc surface remains clean, bright and free from white staining during storage. Hydroclear will also act as a primer for paint or powder coating, eliminating the need for futher processing. Hydroclear does not contain chromium or any other toxic materials.