1、 镀铜色泽评定
1. Evaluation of copper plating color and lustre
由于我国暂无镀铜色泽的统一评判标准，采用评分制来表征镀铜色泽。镀铜定径拉拔后，将室外自然光和室内显微镜下的观察相结合，对镀铜色泽分6个级别。
Due to the fact that there is no uniform evaluation standard of copper color in China, the scoring system is used to characterize the color of copper plating. After copper plating and sizing, the combination of outdoor natural light and indoor microscope observation can be divided into 6 levels.
0级：未发生置换反应，焊丝表面呈黑色或发白亮金属光泽，镜下可见铁基体或镀层破碎，覆盖率不足50％。
Grade 0: no replacement reaction occurs. The surface of the welding wire is black or white bright metallic luster. Under the microscope, the iron matrix or coating is broken, and the coverage rate is less than 50%.
1级：镀层呈暗褐色或略显铜色，镜下显示镀层基本完好，镀层覆盖率80％左右。
Grade 1: the coating is dark brown or slightly copper colored. Under the microscope, the coating is basically intact, and the plating coverage rate is about 80%.
2级：镀层呈亮黄色，但颜色发白，镜下显示镀层均匀、完好。属于焊丝化镀合格。
Grade 2: the coating is bright yellow, but the color is white. Under the microscope, the coating is uniform and intact. It is qualified for welding wire plating.
3级：镀层呈金黄色，镜下显示镀层均匀、致密，属化镀良好状态。
Grade 3: the coating is golden yellow. Under the microscope, the coating is uniform and dense.
4级：镀层金黄略带粉红色，镜下显示镀层均匀、细腻，属镀层优良状态。
Grade 4: the coating is golden and pinkish pink. Under the microscope, the coating is uniform and delicate, which is a good coating state.
5级：镀层近粉红色，优于4级。
Level 5: the coating is near pink, superior to grade 4.
2、镀层结合力判定
2. Determination of the binding force of the coating
考虑到焊丝在使用过程中会与焊枪导电嘴摩擦，因此需对镀铜焊丝的镀层结合力进行评判。
Considering that the welding wire will be rubbed with the nozzle of the welding torch during the use, it is necessary to evaluate the bonding force of the copper plating wire.
结合力评判：把待测试成品焊丝弯成角度相同的曲线，在同样的纸上反复摩擦相同次数后观测镀铜焊丝。
Combining force evaluation: the finished product welded wire is bent into the same angle curve, and the same time after repeated friction on the same paper, the copper plating wire is observed.
1级：弯曲处铜层全部剥落；
1 level: the copper layer in the bend is all peeled off;
2级：铜层较大量剥落，呈椭圆形；
Level 2: the copper layer is a large number of flaking and elliptical.
3级：铜层有少量剥落，呈圆点状，暴露少量焊丝铁基体；
Grade 3: the copper layer has a small amount of spalling, showing a round dot, exposing a small amount of iron substrate.
4级：铜层基本未剥落，铁丝基体基本无暴露；
Grade 4: the copper layer is basically not spalling, and the iron wire matrix is basically unexposed.
5级：铜层完全未剥落，且铜层覆盖良好，铁丝基体完全未暴露。
Grade 5: the copper layer is not spalling completely, and the copper layer is well covered, and the iron wire matrix is completely unexposed.
3、脱铜的判定标准
3. Determination of decopper
镀铜焊丝以自身为芯棒进行自缠绕，缠绕后由于外侧延伸增大，如果镀铜结合力不好，会造成镀铜层开裂、脱铜。
The copper plating wire is self winding with its own mandrel. After winding, due to the increase of the lateral extension, if the copper bonding force is not good, the copper coating will be cracked and copper removed.
结果评判：当以自身为芯棒进行自缠绕时，紧密缠绕5匝以上后，在50倍显微镜下观察，如果缠绕后焊丝外侧部分裂纹、起鳞超过50%或者在脱脂棉棒擦拭后看到脱落的铜皮则判定为脱铜。反之，裂纹、起鳞不超过50%且脱脂棉擦拭后未见脱落铜皮，则判定为不脱铜。
The results are as follows: when self winding is self winding, it is tightly wound over 5 turns and is observed under 50 times of microscope. If the outer part of the welding wire is wound, the scale is more than 50% or the skimmed cotton rod is wiped, the peeling copper skin is judged to be decopper. On the contrary, the cracks and scales do not exceed 50% and no copper peel is removed after the cotton is polished.
4、防锈性能判定
4, determination of antirust property
将待评测焊丝悬挂在装有60℃温水的烧杯上方，静置15min后将焊丝取下，观察2mm长焊丝一周表面上的锈蚀坑平均值作为评判标准。
The welding wire is suspended above the beaker with warm water at 60 degrees centigrade. After 15min, the welding wire is removed and the average value of the corrosion pits on the surface of the 2mm long wire for one week is observed as a criterion.