钢铁常温发黑处理是一种新工艺,可替代传统的碱性加热发黑工艺。常温发黑质量保证的关键在于发黑的前处理——除油和除锈,除油处理要求十分严格,除锈也非常重要。零件除油除锈干净后,方可进行发黑处理。发黑的先决条件是发黑件表面要能与槽液相接触,假如工件上有锈斑或氧化皮存在,便接触不良,发黑后就呈现出花斑、膜层不牢固等缺陷。除锈的基本要求是锈要除尽,尽量不损坏没有生锈的基体。下面所介绍的除锈方法,同样适合于传统的碱性发黑前处理、电镀前处理、油漆前处理等等。一、化学酸洗除锈法金属零件表面都存在着一层程度不同的锈蚀产物或黑色氧化皮,最简单的处理办法是直接用酸洗。常用的酸液有硫酸和盐酸。它们的优缺点和使用条 Blackening of steel at room temperature is a new technology that can replace the traditional black alkaline heating process. Blackening at room temperature quality assurance is the key to the black pre-treatment - degreasing and rust removal, degreasing requirements are very strict, rust is also very important. Part degreasing rust clean, before blackening treatment. The prerequisite for blackening is that the surface of the black part should be able to come into contact with the bath liquid. If there is rust or scale on the workpiece, it will be badly touched, flawed after the blackening, and defects such as the film is not solid. The basic requirement of rust is to remove rust, try not to damage the substrate without rust. Described below the rust method, the same applies to the traditional alkaline black pretreatment, pre-plating, paint pretreatment and so on. First, the chemical pickling rust metal surface there is a layer of different levels of corrosion products or black oxide, the simplest way is to directly pickling. Commonly used acid with sulfuric acid and hydrochloric acid. Their advantages and disadvantages and the use of bar