Common rust removal methods and requirements

PublishTime：2018-07-06                 Click：1795

(a) commonly used derusting method All kinds of surface finish of the commonly used derusting method. Type metal surface finish commonly used derusting method. 1 ∽ with grinding wheel, steel wire brushes, blow with, gauze live pickling derusting. 2 1 ~ 4 with non-metallic blow with, or the granularity of no. 150 oil-stone gauze JiXieYou wipe or dip in by derusting. 3 5 ~ 6 with fine oil-stone or particle size 150 ~ 180, dip in JiXieYou gauze wiped or by derusting. 4 7 ~ 9 first to use the no. 180 or 240, particle size of gauze dip in JiXieYou is wiped, then use clean flannelette dip in JiXieYou or fine grinding paste mixed to finish. Note: 1. The non-ferrous metal processing surface corrosion, application of not less than 150, particle size gauze JiXieYou dip in wipe, sliding bearing alloy surface shall not use gauze is wiped; 2. The finish is not less than 3, and the shape is simple (no holes, slots, joints, etc.) the mental components can be pickled by 6% sulfuric acid or 10% hydrochloric acid. 3. Parts of the finish 4~6 are cleaned by acid anhydride phosphoric acid solution or dipped in industrial acetic acid with cotton cloth. The ratio of acid anhydride phosphoric acid water solution and the method of use: Acid anhydride 150 g /L Phosphoric acid 30 g/L Moderate pickling 35~95℃ Pickling time 30~60 minutes 4. After pickling, it must be washed immediately and neutralized with aqueous solution containing caustic soda 4 g / L and industrial sodium nitrate 2 g / L. 5. Acid cleaning, rust removal, washing, neutralization, re washing, drying and oiling should be carried out continuously. (二) Quality requirements for rust removal 1. Minor rust removal should be completely removed and metallic luster. 2. Moderate rust removal should be carried out until the surface is smooth, allowing the presence of porphyritic and cloud like rust. 3. Heavy rust should be removed except for black spots in the pit. 4. The weight should maintain the surface finish and fit accuracy of the joint surface and the sliding surface, otherwise proper treatment measures should be taken. 5. After rust removal, use kerosene or gasoline to clean it, dry it, and use proper grease (grease) or antirust oil (grease).