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一、采用加鉻与补鉻工艺的原因耐磨鍍鉻层的加鉻和补铬工艺,是解决鍍层缺陷如:厚度不足、不均匀、无鉻层或脫皮等的回鍍工艺,使有这些缺陷的零件,通过加铬与补铬后能够回用。零件在鍍鉻后产生这些缺陷,与零件几何形状、尺寸大小和电鍍工艺規范等有很大关系。(1) 零件几何形状和尺寸大小对鍍层的关系: 如图1零件在铬酸200克/升、硫酸2～2.5克/升、温度57±1℃、阴极电流密度D_K=40～50安培/分米~2,鍍6小时,結果:在φ77毫米外圆鍍层0.20毫米,中間鍍层0.15毫米,在φ70毫米外圓鍍层0.12毫米,而在φ30毫米外圓鍍层仅0.05毫米,在R上甚至有一点或一条线未鍍到。这主要是由于φ77毫米外圓靠近
First, the use of chrome and chrome-plated technology Reasons for chrome-plated and chrome-plated chrome plating process is to solve the plating defects such as: lack of thickness, uneven, no chrome layer or peeling and other plating process, so that these Defective parts, through the chrome and chrome can be reused. Parts chrome generated after these defects, and parts geometry, size and plating process specifications have a great relationship. (1) Part geometry and size of the relationship between the coating: Figure 1 parts in the chromic acid 200 g / l, sulfuric acid 2 ~ 2.5 g / l, temperature 57 ± 1 ℃, the cathode current density D_K = 40 ~ 50 amps / Dm ~ 2, plated for 6 hours, results: φ77 mm outer coating 0.20 mm, middle coating 0.15 mm, φ70 mm outer coating 0.12 mm, and φ30 mm outer coating only 0.05 mm, There is even a point or line on R that is not plated. This is mainly due to φ77 mm outer circle close