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金属钢结构的喷砂工艺前期控制和磨料控制

发布时间:2015-9-23 9:39:04 浏览次数:601
前期控制
喷砂前,依据《涂装前钢材表面锈蚀等级和除锈等级》规定,对金属结构基体表面锈蚀等级进行评定。仔细检查,清除焊渣、飞溅等附着物,并清洗表面油脂及可溶污物,对无用的焊接体或联接物也应作妥善处理。
磨料控制
喷砂除锈用的砂,要求颗粒坚硬、有棱角、干燥(含水量<2%)、无泥土及其他杂质;以石英砂为好,粗河砂也可;同时,应考虑砂料运输条件,单价高低,回收能力等因素;砂料粒径以0.5~1.5mm为宜,筛选前须晒干,存储于棚内、室内,筛孔大小为:粗筛40~48孔/cm2(粒径1.2mm)、细筛372~476孔/cm2(粒径0.3mm)。

除锈方案确定后,磨料可选河砂、石英砂或二者混合。在岗南水库除险加固中,经预喷比较,将石英砂和河砂按1∶1掺和使用除锈效果最好。



Preliminary control

Sandblasting before, according to the steel surface before coating corrosion level and descaling grade, matrix structure of metal surface corrosion level evaluation. Carefully check, remove welding slag, spatter and other attached objects, and cleaning the surface grease and dirt, soluble on useless welding or connection should be properly handled.

Abrasive control

Sandblasting derusting with sand and asked for hard particles, angular, dry water content (< 2%), no dirt and other impurities; Is good with quartz sand, coarse river sand can be; At the same time, should consider the transportation of sand fill, unit price, recycling capacity factors such as; Particle size of sand fill with 0.5 ~ 1.5 mm advisable, screening should be dried before storage in huts, indoor, mesh size is: coarse sieve 40 ~ 48 hole/cm2 (size 1.2 mm), fine screen 372 ~ 476 / cm2 (size 0.3 mm).

Abrasive cleaning solution is determined, the optional river sand, quartz sand, or both. On-the-job south reservoir and consolidate, then spray the comparison, the quartz sand and river sand according to 1:1 have to use the best cleaning effect.



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